120 GASTROPODA. 



Bissoa (Fremenville). Shell minute, coni- 

 cal, pointed, lengthened, many-wliorled ; aperture 

 rounded; outer lip expanded and slightly thickened. 

 Animal with long slender tentacles ; foot pointed 

 behind ; operculum spiral. 



K. abyssicola. E. parva. Fig. 179 ; f-. 



anatina. proxima. 



Beanii. pulcherrima. 



calathus. punctura. 



cingillus. rubra, 



costata. rufilabris. 



costiilata. sciilpta. 



creniilata. semistriata. 



disjunct us. soluta. 



fulgida. striata. 



inconspicua. striatula. 



interrupta. ulvee. 



labiosa. ventrosa. 



lactea. vitrea. 



littorea. Zetlandica. 



Jeffrey sia (Alder). As Rissoa, hut more trans- 

 parent ; operculum semicircular, plaited, with a 

 projection from the straight edge. 



J. diapbana. 

 globularis. 

 opalina. Fig. 180 ; ^. 



Shenea (Fleming). Shell minute, round, flat, 

 few-whorled. Animal like Btssoa, but the foot 

 rounded behind. 



S. costulata. S. nitidissima. 



Cutleriana. planorbis. Fig. 181 ; |-. 



divisa. rota. 



laevis. 



Truncatella (Eisso). Shell minute, cylindrical, 

 truncated ; whorls striated transversely ; aperture 



