CONTENTS. IX 



PAGE 



Class II. Gasteeopoda. Order II. Pulmonifera... 159 



Section A. Inoperculata 159 



^am. I. HelicidcB. — Helix, Yitrina, Succinea, Buli- 



mus, Achatina, Pupa, Cylindrella, Balea, Tornatel- 



lina, Paxillus, Clausilia ,... 162 



Fam. II. Limacida. — Limax, Incilaria, Arion, Par- 



macella, TestaceUa....; 167 



Fam, III. OncidiadcB. — Oucidiunij Yaginulus 169 



Fam. IV. LimnceideB. — Limnsea, Chilinia, Physa, 



Ancylus, Planorbis 170 



Fam. V. Aiiriculidce. — Auricula, Conovulus, Cary- 



chium, (Siphonaria) 172 



Section B. Operculata 174 



Fam. VI. CyclostomidcB. — Cyclostoma, Perussina ? 



Cyclophorus, Pupina, Helicina, Stoastoma 175 



Fam. VII. AcicididcB. — Acicula, Geomelania 178 



Order III. Opistho-branchiata 179 



Section A. Tectibranchiata 179 



Fam. I. Tornatellidae. — Tornatella, CinuHa, Ringi- 

 cula, Globiconcha, Yarigera, Tylostoma, Ptero- 

 donta ? Tomatina ? 179 



Fam. II. BullidcB. — Bulla, Acera, Cylichna, Amphis- 

 phyra, Aplustrum, Scapliander, BuEcea, Doridium, 

 G astropteron 181 



Fam. III. AjjlysiadcB. — Aplysia, Dolabella, Xotar- 

 chus, Icarus, Lobiger 185 



Fam. IV. PleurohrancMdce. — Pleurobrancbus, Pos- 

 terobrancbcea, Ruucina, Umbrella, Tylodina 187 



Fam. V. Phi/UidiadcB. —Vhyllidia, Diphyllidia 188 



Section B. Xudibranchiata 188 



Fam. VI. Dorid<e. — Doris, Goniodoris, Triopa, 



