MOLLUSCA. 8 1 



Fam. c. Buccinidse. Buccinum (Whelk), Nassa, Pur- 



pura, Oliva. 



Fam. d. Conidae. Conus, Pleurotoma. 

 Fam. e. Volutidse. Valuta, Mitra. 

 Fam./. Cyprseidse (Cowries). Cyprcea, Ovulum. 



Section B. Holostomata. 



Fam. a. Naticidae. Natica, Sigaretus. 



Fam. b. Pyramidellidae. Pyramidella, Chemnitzia. 



Fam. c. Cerithiadas. Cerithium, Aporrhais. 



Fam. d. Melaniadse. Melania. 



Fain. e. Turritellidse. Turritella, Scalaria, Vermetus. 



Fam. /. Littorinidse. Littorina (Periwinkle), Solarium. 



Fam. g. Paludindise. Paludina, Ampullaria. 



Fam. h. Neritidse. Nerita. 



Fam. i. Turbinidse. Turbo, Trochus. 



Fam. j. Haliotidse. Haliotis (Ear - shell), Pleuroto- 



maria. 



Fam. Jc. Fissurellidse. Fissurella (Keyhole Limpet). 

 Fam. /. Calyptreeidee. Calyptrcea (Cup-and-saucer Lim- 

 pet), Capulus (Bonnet Limpet). 



Section C. Cyclobranchiata. 



Fam. Patellidae (Limpets). Patella, Acmcea. 



Section D. Polyplacophora. 

 Fam. Chitonidee. Chiton. 



ORDER III. OPISTHOBRANCHIATA. 

 Section A. Nudibranchiata. 



Families: Doridse (Sea-lemons), ^Eolidse, Dendronotidae, 

 Tethydidse. Doris, dfolis, Doto, Tethys. 



Section B. Tectibranchiata. 



Fam. a. Tornatellidse. Tornatella. 



Fam. b. Bullidse. Sulla (Bubble-shells). 



Fam. c. Aplysiadse. Aplysia (Sea-hare). 



Fam. d. Pleurobranchidae. Umbrella. 



Fam. e. Euncinidas. Runcina. 

 F 



