DESCRIPTION OF THE FRONTISPIECE.
Reading edition
THE MOA OF NEW ZEALAND.
The Frontispiece represents the entire series of bones composing the right foot of the Moa (Dinornis robustus), found imbedded in an erect position, with the corresponding foot a yard in advance, in a turbary deposit, at Waikouaiti, in the Middle Island of New Zealand, in 1849. The figures are one-third less in linear dimensions than the originals.
Figures 1a, 2a, 3a, show the palmar, or under surface of the respective toes, and exhibit the trochlear or articulating extremities of the phalangeal bones.
The ancient swamp or morass in which these matchless specimens were imbedded, is situated on the shore, in a little creek or bay near Island Point, at the mouth of the river Waikouaiti, and is covered by the sea except at the lowest tides. Many remains of the largest species of Moa have from time to time been obtained from this deposit; the bones sent to England by Dr. Mackellar, Mr. Percy Earle, and others, figured and described in the Zoological Transactions by Professor Owen, were from this locality.
The specimens figured were obtained by Mr. Walter Mantell, in 1849, when visiting Waikouaiti, as Government Commissioner for the settlement of Native claims. On the recession of the tide, the upper (or proximal) ends of the metatarsals were just visible above the surface: these were carefully dug up, and all the bones of the respective toes numbered, one by one, as they were extracted from the soil. In this state they were sent to me, and have subsequently been articulated under my direction, in their natural order of arrangement.[1]
The condition and position of the bones, and the nature of the deposit,—evidently an ancient morass, in which the New Zealand flax (phormium tenax) once grew luxuriantly,—remind us of the very similar circumstances in which the extinct gigantic Elks in Ireland, and the Mastodons in America, have occasionally been found engulfed in peat bogs and morasses; and, as my son emphatically observes, it is impossible to arrive at any other conclusion than that the Moa to which these feet belonged, had sunk down in the swamp, and perished on the spot. Vertebræ and other parts of a skeleton of a bird of the same proportions, were dug up near the feet.
As the specimens under examination are the first examples in which the entire series of the phalangeal and ungueal bones have been found in natural connexion with the metatarsals, I subjoin the admeasurements of the several parts, to render the peculiar construction of the feet in one species of the lost race of the colossal birds of New Zealand, more obvious to those who may feel interested in the subject.
TARSO-METATARSAL BONES.
Inches. Lines.
Length of the shaft from the distal end of the middle trochlea to the proximal extremity 17 0
Circumference of the proximal end 11 9
Transverse diameter, or width, of ditto 4 6
Antero-posterior diameter of ditto 3 6
Circumference of the middle of the shaft 6 3
Antero-posterior diameter of ditto 1 8
Transverse diameter of ditto 3 6
Width of the distal, or trochlear, end 6 3
Circumference of the trochlear end 15 6
Antero-posterior diameter of the middle trochlea 3 9
PHALANGEAL BONES.
Inner Toe. (Fig. 1.) Middle Toe. (Fig. 2.) Outer Toe. (Fig. 3.)
Inches. Lines. Inches. Lines. Inches. Lines.
First, or proximal phalanx { Length 4 9 — 4 3 — 3 2
Circumference of proximal end 6 6 — 6 9 — 5 9
Second phalangeal bone. { Length 1 9 — 2 6 — 1 9
Circumference of proximal end 3 0 — 5 3 — 4 9
Third phalangeal bone { Length Ungueal. { 3 0 } 4 0 — 1 9 — 1 0
Circumference of proximal end — 4 6 — 4 6
Third phalangeal bone { Length Ungueal. { 3 0 } 4 2 — 0 11
Circumference of proximal end — 4 0
Fifth ungueal bone { Length 2 6
Circumference of proximal end 3 9
The total length of the toes is as follows:—inner digit, 9½ inch.; middle, 11½ inch.; outer, 91/3 inch. The transverse diameter of the expanse of the foot, from the distal extremity of the inner toe (fig. 1a), to that of the outer one (fig. 3a), is 15½ inches. The length from the posterior part of the trochlear extremity of the metatarsal to the distal end of the ungueal of the middle toe (fig. 2a), is 13 inches. If to the actual dimensions of the bones be added the proportional thickness of the cartilaginous integuments, nails, &c., the length of the foot of the living bird may be estimated at about 16 inches, and the breadth at 17 or 18 inches.
From the great width and solidity of the metatarsals, and the form and corresponding size and strength of the phalangeals and ungueals, the ornithologist will perceive that the feet of the Moa must have constituted powerful instruments for scratching, digging, and uprooting the sub-terrestrial vegetable substances, which Professor Owen, with great probability, infers, formed the chief sustenance of the extinct colossal birds of New Zealand.
According to the relative proportions of the bones composing the hinder extremities of the gigantic species of Moa, the corresponding tibia, or leg-bone, of the feet above described, would be two feet nine inches in length, and the femur, or thigh bone, nine and a half inches; the total height of the bird was probably about ten feet.
Tibiæ, femora, and other bones of much larger proportions, (apparently of Dinornis giganteus and D. ingens,) were obtained from the same locality; some of these indicate birds of eleven or twelve feet in height; dimensions exceeding by one-third those of the largest known existing species of Struthionidæ—the Ostrich.[2]
Referring the reader to the additional account of the fossil birds of New Zealand given in a subsequent part of this volume (see Supplementary Notes, p. 173), I will conclude this notice with a few general remarks. From the numerous facts relating to the fossil remains of birds from our Antipodean colony, that have now been brought under the consideration of the naturalists and geologists of this country, we may safely conclude, that at a period geologically recent, but of immense antiquity in relation to the human inhabitants of those Islands, New Zealand was densely peopled by tribes of colossal struthious bipeds, of species and genera that have long since become extinct. I believe that ages ere the advent of the Maori tribes, the Moa and its kindred were the chief inhabitants of the country, and that from the period when those Islands were taken possession of by man, the race gradually diminished, and the colossal types were finally annihilated by human agency. That some of the largest species were contemporary with the Maories, there can now be no reasonable doubt. Apart from native traditions, and songs and tales in which allusions are made to the gigantic magnitude and flowing plumage of the Moa, the collocation of calcined and half roasted bones of the Dinornis, of dogs, and of the human species, in the ancient fire-heaps of the aborigines, and the unequivocal marks of the celt or axe of jade on some of the tibiæ,—the chips or cuts having evidently been made on the bones when recent,—afford incontrovertible proof that the last of the Moas, like the last of the Dodos, was annihilated by human agency.
From the remarkable size and strength of the thighs, legs, and feet of the Moas, it is clear that the hinder limbs must have constituted powerful locomotive organs; and when we consider the vast swarms of the largest species which existed at some remote period, it seems highly probable that this family of colossal birds,—a family unknown in any other part of the world,—was not originally confined within the narrow geographical limits of modern New Zealand, but ranged over a vast continent now submerged, and of which Phillip and Norfolk Islands, and Chatham and Auckland Islands, and those of New Zealand, are the culminating points.
But whatever may be the result of future discoveries as to the relative age of the bone-deposits, or the existence or extinction of any of the colossal species of Moa, or the former extension of the race over countries now submerged, one astounding fact must ever remain unassailable—the vast preponderance of the class Aves or Birds, that prevailed, and which still prevails, in the fauna of New Zealand, to the almost entire exclusion of mammalia and reptiles. Any palæontologist who saw only the collections sent over by my son, must have been astonished at their extent and variety. I may venture to affirm that such an assemblage of the fossil bones of birds was never before seen in Europe: nearly fifteen hundred specimens, collected from various parts of the country, with scarcely any intermixture of the remains of any other class;—it is a phenomenon as startling as the exclusively reptilian character of the fauna of the Wealden epoch. But the fauna of New Zealand, even at the present time, presents a character as ornithic and as anomalous as its ancient one; for while there are upwards of fifty or sixty genera of birds, there is but one indigenous mammalian quadruped known to naturalists—a species of rat! In this respect, therefore, as well as in its flora, in which ferns and other cellulosæ of peculiar types prevail to an extent unknown elsewhere, the country offers a striking example of that now acknowledged fact in natural history—a centre or focus of creation of certain organic types. And this law, with whose operation during the palæozoic and secondary ages modern geological researches have made us familiar, appears to have continued in unabated energy to the present moment.
From what has been advanced, it is manifest that the present geographical distribution of special groups of terrestrial animals and plants, displays as many anomalies in the relative predominance of the different classes and orders over certain areas, without relation to climatorial or other obvious physical conditions, as can be traced in the natural records of the earlier ages of the world. The conclusion therefore forces itself upon the mind, that throughout the vast periods of time to which our retrospective knowledge extends, the geological changes of the earth's surface, and the appearance and obliteration of species and genera, have been governed by the same physical and organic laws; and that notwithstanding the variable conditions of the land and the water, indicated by the sedimentary formations, there was at no period a greater discrepancy in the assemblages of certain types of the animal and vegetable kingdoms, than exists at present.
Of the nature of that law by which the extinction of a race of highly organized beings is determined, and whose effects through innumerable ages palæontology has in part revealed, we are as utterly ignorant as of that which governs the first appearance of the minutest living animalcule which the powers of the microscope enable us to descry; both are veiled in inscrutable mystery, the results only are within the scope of our finite comprehension.[3]