DAVILA. 415 



The West Indies, the Mediterranean, the Crimea, India, 

 New Zealand, and Chili harbour examples of this genus, 

 the shells of which are usually more or less wedge-shaped. 



Species of Donacilla. 



angulus, Desk. heterodon, Desk. 



angusta, Desk. nitida, Desk. 



cornea, Poll. pnecisa, Desk. 



elongata, Desk. transversa, Desk. 



Genus ANAPA, Gray. 



Shell sub-trigonal, ventricose, truncated behind. Hinge 

 with the lateral teeth sub-equal, compressed, smooth. 

 Siphonal inflection none. 



Ex. A. triquetra, Hanley, pi. 106, fig. 5, 5, a. 



In this and the following genus D civil a there is an 

 entire absence of any sinuosity in the pallial line. The 

 two species of Anapa known are found in New Zealand and 

 Van .Diem an 's Land. 



Species of Anapa. 

 cuneata, Desh. ti'iquetra, Hanley. 



Genus DAVILA, Gray. 



Shell ovate- cuneate, truncated behind. Hinge with the 

 lateral teeth unequal, the anterior small and perpendicular. 

 Siphonal inflection none. 



Ex. D. crassula, Desha yes, pi. 100, fig. 6, 6, a. 



The form of the shell in Davila, which is ovate and 



