Order V.— HETEROPODA, 49 



Petrotrachea, 50 



Carinaria, 50 

 Atlanta, 51 

 Firola, 51 

 Timorienna, 51 

 Monophora, 51 



Phylliroe, 52 



Order VI.— PECTINIBRANCHIATA, 52 



Fam. 1. — Trochoida, 53 



Trochus, 53 



Tectarium, 53 

 Calcar, 54 

 Rotella, 54 

 Cantharis, 54 

 Infundibulum, 54 

 Telescopium, 54 

 Trochus, 54 

 Solarium, 55 

 Evomphalus, 55 



Turbo, 55 



Turbo proper, 55 

 Delphinula, 55 

 Pleurotoma, 56 

 Turritella, 56 

 Scalaria, 56 

 Cyclostoma, 57 

 Valvata, 57 



Paludina, 58 



Littorina, 58 



Monodon, 58 



Phasianella, 59 



Ampullaria, 59 



Lanista, 59 

 Helicina, 59 

 AmpuUina, 59 

 Olygira, 59 



Melania, 60 



Rissoa, 60 

 Melanopsis, 60 

 Pirena, 60 



Acteeon, 61 



Pyramidella, 61 



Janthina, 61 



Nerita, 61 



Natlca, 62 

 Nerida proper, 62 

 Velata, 62 

 Neritina, 62 

 Clithon, 62 



