vni TABLE OF CONTENTS. 



PAGE 



Class II. Ophiuroidea 337 



Class III. Crinoidca 338 



Sub Class I. Eucrinoidea 342 



Sub Class II. Edrioasteroidea 342 



Sub Class III. Cystidea 342 



Sub Class IV. Blastoidea 342 



Class IV. Echinoidea 343 



Order I. Palechinoidea 345 



Order II. CidaridiE 345 



Order III. Clypeastroidea 346 



Order IV. Spatangoidea 346 



Class V. Holothuroidea 346 



Order I. Actinopoda 349 



Order II. Paractinopoda 349 



Summary 350 



Phylum VIII. MOLLUSCA 351 



Class I. Amphineura 356 



Sub Class I. Placophora 356 



Sub Class II. Solenogastres 358 



Class II. Acephala 358 



Order I. Protoconchiae 365 



Order II. Heteroconchise 367 



Class III. Scaphopoda 369 



Class IV. Gasteropoda 369 



Order I. Prosobranchiata 378 



Order II. Opisthobranchiata 38 1 



Order III. Pulmonata 383 



Class V. Cephalopoda 384 



Order I. Tetrabranchia 394 



Order II. Dibranchia ^594 



Summary 395 



Phylum IX. Arthropoda 39S 



Class I. Crustacea _).o8 



Sub Class I. Trilobitae 41 _|. 



Sub Class II. Phyllopoda ^.i 5 



Order I. Branchiopoda _|.j6 



Order II. Cladocera ^i- 



Sub Class III. Copepoda _j.iy 



Order I. Eucopepoda .^21 



Order II. Siphonostomata _|.2 2 



Sub Class IV. Ostracoda 422 



Sub Class V. Cirripedia _l^2 ^ 



Order I. Lepadidse ,^25 



Order II. Balanidce ^2S 



Order III. Rhizocephala ,26 



Sub Class VI. Malacostraca 426 



Legion I. Leptostraca _l^27 



Legion II. Thoracostraca _j^27 



Order I. Schizopoda 42S 



Order II. Stomatopoda 429 



