LIST OF ILLUSTRATIONS.
Reading edition
1 Triarthrus becki Green. Diagram of limb to show nomenclature employed 20
2 Neolenus serratus (Rominger). Two thoracic appendages 24
3 The same. An exopodite 26
4 The same. A so-called "epipodite" 26
5 The same. The so-called "exites" 29
6 The same. A cephalic limb 29
7 The same. Restoration of a transverse section 30
8 The same. Restoration of the ventral surface 31
9 Isotelus. Restoration of the ventral surface 38
10 Triarthrus becki Green. Restoration of the ventral surface 41
11 The same. Median appendage 44
12 Ceraurus pleurexanthemus Green. Slice showing an exopodite 49
13 Calymene senaria Conrad. Slice showing cephalic coxopodites 53
14 The same. Another similar slice 53
15 The same. Slice showing method of articulation of the appendages 53
16 The same. Restoration of the ventral surface 55
17 Ceraurus pleurexanthemus Green. Slice showing the method of articulation of the appendages 58
18 The same. Slice showing an exopodite above an endopodite 58
19 The same. Restoration of a transverse section 60
20 Cryptolithus tessellatus Green. Restoration of the ventral surface 63
21 Ceraurus pleurexanthemus Green. Slice showing the abdominal sheath 79
22 The same. Slice showing the large alimentary canal 79
23 Calymene senaria Green. Slice showing the large alimentary canal 79[15]
24 Ceraurus pleurexanthemus Green. Restoration of a longitudinal section 81
25 Cryptolithus tessellatus Green. Cheek showing the genal cæca 84
26 Illænus. Volborth's figure of the heart 85
27 Heart of Apus 85
28 Isotelus gigas Dekay. The Panderian organs 91
29 Ceraurus pleurexanthemus Green. Restoration, showing heart, alimentary canal, and extensor muscles 93
30 The same. Longitudinal section of cephalon 95
31 Nileus armadillo Dalman. Moberg's figure of the muscle-scars 95
32 Marrella splendens Walcott. Restoration of the ventral surface 116
33 Triarthrus becki Green. Appendage of the anterior part of the thorax 126
34 Apus. Appendage from the anterior part of the trunk 127
35 Weymouthia nobilis (Ford) 138
36 Naraoia compacta Walcott 145
37 Pagetia clytia Walcott 145
38 Asaphiscus wheeleri Meek 145
39 Pædeumias robsonensis Burling 145
40 Robergia sp. 145
41 Diagram showing possible lines of descent of the Arthropoda 150
42 Triarthrus becki Green. Thoracic appendages 155
43 The same. Pygidial appendages 157
44 The same. Pygidial appendages 158
45 Cryptolithus tessellatus Green. Drawing of the best single specimen 159
46 The same. Part of the thorax and pygidium, with appendages 162
Frontispiece. Charles Emerson Beecher, 1896.
Plates 1-5. Photographs of Triarthrus becki, made by C. E. Beecher.
Plate 6. Photographs of Triarthrus becki (figs. 1-3), Acidaspis trentonensis (fig. 6), and Cryptolithus tessellatus (fig. 7), made by C. E. Beecher. Photographs of the endopodites of a probable species of Calymene (figs. 4, 5)
Plates 7-8. Photographs of Cryptolithus tessellatus, made by C. E. Beecher.
Plate 9. Drawings of Cryptolithus tessellatus, made by C. E. Beecher or under his direction.
Plate 10. Photographs of Isotelus latus and I. maximus, made by C. E. Beecher.
Plate 11. Drawing of a restoration of Ceraurus pleurexanthemus, made by Elvira Wood.