Note 138 — {87} CHAPTER V
Reading edition
From Fort Osage.
Productus spinosus, Say.—Longitudinally and transversely subequally striated, the transverse striæ somewhat larger than the others; a few remote short spines, or acute tubercles, on the surface, arising from the longitudinal striæ.
Breadth an inch and a half; the striæ are somewhat indistinct—as in No. 5.
Productus incurvus, Say.—Shell much compressed; hinge margin nearly rectilinear; surface of the valves longitudinally striated; convex valve longitudinally indented in the middle; the beak prominent and incurved at tip; opposite valve with a longitudinal prominence in the middle; the beak incurved into the hinge beneath the other beak, and distant from it.
Width more than 22⁄5 inches. A few univalves also occurred, but they were so extremely imperfect that their genera could not be made out.
A dark-coloured carbonate of lime, containing small Terebratulæ like the T. ovata of Sowerby, but less than half as long.
No. 1. a mass of carbonate of lime, containing segments of encrinites in small ossicula.
6. A Caryophylla of a single star, about four inches long, of an irregularly transversely undulated surface, imperfect at each end, but seems to have been attached at base. Near the base it is bent at an angle of about 45 degrees.
Some small and young specimens of the Terebratula, like T. subundata of Sowerby.
Miliolites centralis. Say.
12. Astrea. A species of very minute alveoles. From the state of the petrifaction no radii are perceptible, so that the genus is not determinable.
Saltworks near Arrow Rock. Columnar segments of the Encrinus.
Inferior portion of the head of A. Pentramea. Say.
Segments of the column of an oval encrinus, much narrower in the middle than the oval vertebra of an encrinite represented by Parkinson, Vol. 2. pl. 13. f. 40.—resembling those of the genus Platycrinites of Miller.—James.