CALYPTE.EDJ5. 65 



ultimo expanse, divaricatim costato ; septo arcuato, margine 

 columellari tumide reflexo. — A dorsal view gives the idea of 

 a helicoid shell. The septum is more like that of some cre- 

 piduloe. 



20. MAMiLLARis, f. 69, 70, 71, Broderip. — Conica Isevis, 

 extus sublivida, intus obscure fusca ; spira mamillata, septo 

 breviter dolabriformi. — Conical, smooth, rather livid without, 

 sometimes coffee-coloured within, straight-sided ; apex a 

 little mamillated coil. 



21. SINENSIS, f. 75-79, LinncBUs. — Depresso-conica albida, 

 plus minusve spinosa, ad latera subconcava; septo acute 

 trigono. — A flattened cone with the lateral outlines a little 

 concave ; the surface covered more or less perceptibly with 

 minute spinous points. 



Genus CREPIDULA. 



Testa plerumque ovata patelliformis ; apice marginali, 

 frequenter terminali ; subtus concava, lamina basali septi- 

 formi. — In CrepidiUa, the septiform plate is scarcely spiral 

 in any case, and in most cases not at all so. It covers about 

 half the cavity. In a few species it is lobed or loop-like in 

 the middle, with a deep notch at the side. 



Species. 



1. DiLATATA, f. 100, 101, 102, Lamavck. — Semirotunda, 

 fulva, frequenter variegata, subtus castaneo vel purpureo 

 varie picta, apice laterali, subspirali ; septo albo, subspirali, 

 margine infra lobatim producto, ad terminum emarginato. — 

 The white variety is the C. pallida of Broderip. 



