CONTENTS. 



PAGE 



Branch VIII. — Veetkbbates 1 



Class I. — Tunicates 53 



Sub-Class II. — Tethyoida 56 



OeDER I. — COPELAT^ 56 



Order II. — Monascidi^ 56 



Order HI. — Synascidi^ 57 



Order IV. — Litci^ '. 59 



Sub-Class II. — Thaliaci* 59 



Order I. — Cyclomyaria 59 



Order II. — Desmomyaria 60 



Class II. — Ackania 62 



Class III. — Cyclostomi 65 



Order I. — Hyperoabtia 65 



Order II. — Hyperotretia 67 



Class IV. — Elasmobran chii 68 



Sub-Class I. — Holocbphali 71 



Sub-Class II. — Plagiostomi 72 



Order I. — Squali 72 



Order II. — Eai^ 84 



Class V. — Pisces 90 



Sub-Class I. — Ganoidea 90 



Order I. — Acanthodini 92 



Order II. — Placodeemi 92 



Oedee III. — Chondeostei 92 



Oedbr IV. — Pycnodontini 94 



Order V. — Crossofteeygii 95 



Order VI. — Ginglymodi 96 



Order VII. — Halecomorphi 97 



Sub-Class II. — Teleostei 98 



Order I. — Symbeanchii 100 



Oeder II. — Apodes 100 



Order III. — Lyomeri 109 



Order IV. — Opisthomi 110 



Order V. — Nematognathi 110 



Order VI. — Scyphophori 121 



Order VII. — Teleocephali 121 



Sub-Order I. — Gymnonoti 123 



Sub-Order II. — Eventognathi 125 



Sub-Order III. — Isospondyli 134 



Sub-Order IV. — Haplomi 168 



Sub-Order V. — Xenomi 173 



Sub-Order VI. — Synentognathi 173 



Sub-Order VII. — Peecesoces 176 



V 



