LAMARCK'S DIVISIONS. 



Page. 



i. 



Hyalea ........... 23 



Cleodora 23 



Cymbrulia ......... 23 



2. 



Chiton 24 



Patella 24 



Ancylus 25 



Umbrella 24 



Scutina 24 



Fissurella 24 



Emarginula 25 



Calyptraea 25 



Crepidula 25 



3. 



Dolabella 25 



Bullaea 43 



Bulla 43 



4. 



Testacella 26 



Vitrina 26 



5. 



Helix 30 



Carocolla 31 



Anostoma 31 



Helicella. 45 



Helicina 31 



Pupa 30 



Clausilia 29 



Bulimus 29 



Amphibulima 29 



Achatina 28 



Cyclostoma 34 



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Auricula 28 



Lymnseus 27 



Physa 27 



Planorbis -. 30 



Melania 27 



Melanopsis. 27 



Pyrene 28 



Conovula 28 



Paludina 34 



Valvata . . 34 



Ampullaria 31 



Navicella 24 



Neritina 32 



Nerita 32 



Natica 32 



Ampullina 31 



Iantbina 35 



Tornatella 29 



Pyramidella 38 



Vermicularia 33 



Scalaria 33 



Delphinula 33 



Halyotis 26 



Stomatia 26 



Stomatella 26 



Sigaretus 26 



Turritella 33 



Phasianella 28 



Turbo 33 



Monodonta 34 



Trochus 35 



Solarium 35 



6. Canalifeile. 



Cerithium 38 



Pleurotoma 37 



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Clavatula 37 



Turbinella 37 



Fasciolaria 37 



Pyrula 37 



Fusus 36 



Murex 36 



Ranella 36 



Triton 36 



Struthiolaria 42 



Rostellaria 39 



Pterocera 43 



Strombus 42 



8. Pdrpubifeh^. 



Purpura 40 



Concholepas 40 



Harpa 39 



Dolium 39 



Buccinum 39 



Terebra 38 



Gassidaria 40 



Cassis 41 



Nassa 40 



Ricinula 40 



Monoceros 40 



Eburna 38 



9. COLUMELLA!^. 



Cancellaria 40 



Colombella 42 



Mitra 38 



Voluta 41 



Marginella 42 



Volvaria 42 



