CONTENTS. IX 



PAGE. 



CLASS II. GASTEROPODA. ORDER II. PULMONIFERA ... 159 



SECTION A. INOPERCULATA 159 



Fam. I. Helicidce. Helix, Vitrina, Succinea, Buli- 

 mus, Aehatina, Pupa, Cylindrella, Balea, Tornatel- 

 lina, Paxillus, Clausilia ,... 162 



Jam. II. Limacidce. Limax, Iiicilaria, Arion, Par- 

 macella, TestaceUa .'. 167 



Jam. III. Oncidiadce. Oncidium, Vaginulus 169 



Fam. IV. LlmncBidce. Limrisea, Chilinia, Pliysa, 

 Ancylus, Planorbis 170 



Fam. V. Auriculidce. Auricula, Conovulus, Cary- 



chium, (Siplionaria) 172 



SECTIONS. OPERCULATA f 174 



Fam. VI. Cyclostomidce. Cyclostoma, Ferussina ? 

 Cyclopliorus, Pupina, Helicdna, Stoastoma 175 



Jam. VII. Adculida. Acicula, Geomelania 178 



ORDER III. OPISTHO-BRANCHIATA 179 



SECTION A. TECTIBRANCHIATA 179 



Fam. I. Tornatellidae. Tornatella, Cinulia, Ringi- 

 cula, Globiconcha, Yarigera, Tylostoma, Ptero- 

 donta? Tornatina ? 179 



Fam. II. Bullidce. Bulla, Accra, Cyliclina, Amphis* 

 phyra, Aplustrum, Scaphander, Bullsea, Doridium, 

 Gastropteron 181 



Fam. III. Aplysiada. Aplysia, Dolabella, N^tar- 

 chus, Icarus, Lobiger 185 



Fam. IV. Pleurolranchidtf . Pleurobranchus, Pos- 

 terobranchaea, Euncina, Umbrella, Tylodina 187 



Fam. V. Pliyllidiada Phyllidia, Dipliyllidia 188 



SECTIONS. NUDIBRANCHIATA 188 



Fam. VI. Doridce. Doris, Goniodoris, Triopa, 



