CONTENTS. 



BUAN'CH v. — VElillES .... 



Class I. — Pl.ituelmintue.v . 

 Sub-Class I. — Tuhbellaria. 



SL'B-Ci.ASS II. — TUEMATOD.\. 



Sub-Class III. — Cestoda 

 Class II. — Rotifeka 

 Class III. — Gastbotkicu.! 

 Class IV. — Xematoda ... 

 Class V. — Acantiiocepii.\li 

 Class VI. — Cu.etognathi 

 Class VII. — Nemertea 

 Class VIII. — Gei-iiyrea 

 Class IX. —Annelid.v 

 Sub-Class I. — Auchiannelida 

 Sub-Class II. — Cu.etopoda . 

 Sub-Class III. — Enteuopneusti 

 Sub-Class IV. — Discopuop.i . 

 Branch VI. — Molluscoidea . 

 Class I. — Polyzoa . . ' . 

 Sub-Class I. — Entoprocta 

 Sub-Class II. — Ectoprocta . 

 Sub-Class III. —PoDOSTOMATA . 

 Class II. — Braciiiopoda . 

 Branch VII. — Mollusca . . . , 

 Class I. — Acephala .... 

 Class II. — Cephalophora . 

 Sub-Class I. — Scapuopoda . 

 Sub-Class II. — Gasteropoda . 

 Super-Order I. — Isopleura 

 Order I. — Ch.etodebjle . 

 Order II. — Neomenoidea 

 Order III. — Polyplacophora . 

 Super-Order II. — Anisopleura 

 Order I. — Opisthobranchi.yta . 

 Order II. — Pulmonata . 

 Order III. — Zygobranchia 

 Order IV. — Scutibranchia . 

 Order V. — Ctenobranchia 

 Order VI. — Heteropoda 

 Sub-Class III. — Pteropoda 

 Order I. — Thecosomata . 

 Order II. — Gymnosomata . 

 Class III. — Cephalopoda 

 Sub-Class I. — Tetrabranchiatjv . 

 Sub-Class II. —Dibranchiata 

 Order I. — Octopoda . 

 Order II. — Decaceba 



