528 



SYSTEMATIC INDEX. 



MOLLUSCA, 



243 



Pileolus, 



263 



Cephalopoda, 



246 



Navicella, 



263 



Cuttle-fish, 



247- 



Calyptraea, 



263 



Nautilus, 



247 



Siphonaria, 



264 



Bekmnites, 



248 



Sigaretus, 



264 



Ammonites, 



248 



Cryptostoma, 



264 



NummuUtes, 



248 



Conus, 



265 



Ptehopoda, 



249 



Cypraea, 



265 



Clio, 



249 



Ovula, 



265 



Cymbula, 



249 



Terebellum, 



265 



Limacina, 



249 



Voluta, 



265 



Gastehopoba, 



250 



Oliva, 



266 



Slugs, 



252 



Buccinum, 



266 



Snails, 



252 



Ceritliiuin, 



267 



Planorbis, 



253 



Murex, 



267 



Lymnaeus, 



253 



Strombus, 



268 



Physa, 



253 



Vermetus, 



268 



Auricula, 



253 



Magilus, 



269 



Conovulus, 



253 



Siliquarla, 



269 



Doris, 



254 



Halyotis, 



269 



Tritonia, 



255 



Fissurella, 



270 



Thethys, 



255 



Patella, 



270 



Scyllsea, 



255 



Chiton, 



270 



Glaucus, 



255 



ACEPHAIA, 



271 



Phyllidia, 



255 



Acarda, 



272 



Pleurobranchus, 



256 



Ostrea, 



273 



Aplysia, 



256 



Pecten, 



273 



Dolabella, 



257 



Lima, 



273 



Notarchus, 



257 



Anomia, 



274 



Akera, 



257 



Placuna, 



274 



Gastropteron, 



258 



Spondylus, 



274 



Umbrella, 



258 



Malleus, 



274 



Trochus, 



260 



Vulsella, 



275 



Turbo, 



260 



Perna, 



275 



Paludina, 



261 



Etheria, 



275 



Littorina, 



261 



Avicula, 



275 



Phasianella, 



261 



Pinna, 



275 



AmpuUaria, 



261 



Area, 



276 



Melania, 



261 



Trigonia, 



276 



Tornatella, 



262 



Mytilus, (Muscles) 



276 



Pyramidella, 



262 



Anodontea, 



277 



Janthina, 



262 



Unio, 



277 



Nerita, 



262 



Cardita, 



277 



Pileopsis, 



263 



Cypricardia, 



277 



Hipponyx, 



263 



Coralliophaga, 



278 



Crepidula, 



263 



Venericardia, 



278 



