﻿GASTROCH.ENA.— Pi,, 



Species i. (Mus. Brit.) 



(iASTi;ocH^NA APERTISSIMA. Gas. tesld eloiiijatd, sith- 

 compressd ; tenuiter striata ; latere aniieo cuneato ; 

 latere postico rectiusculo, ad terminum rotritide 

 suhacummaio ; hioiu lata fit elonijato, ffr'' nd fer- 

 minum posticwm exteyiso. 



The wide open Gasteooh.bna. Sht-ll elongated, 

 rathei- compressed, finely striated ; anterior side 

 cnneated ; posterior side rather straight, roundly 

 snbacuminated ; hiatus broad and elongated, 

 almost extending to the posterior end. 



])eshayes. Proc. Zool. Soo. 1854, p. 326. 



jj„h. ? 



Spec 



(Mn.« 



hiatii. Lit.i 



Gastroch^ENA DiKEiriLls. G1.IS. t''Kli! nli/iijiid, teniiitur 

 sti-iidij, '■iini/iris^i!, rmi^ipinni, antice gihhosd, 

 hill!, ml tiii.iiiium. acuminatd ; 

 jumt lUfiliiim iwte-iisu. 



The difficult Gastp.och.kna. Shell oblique, iinely 

 striated, compressed, cuneiform, anteriorly gib- 

 bous, narrow ; posteriorly bi'oad. acuminated at 

 the end : hiatus broad, extended nearly to the 

 end. 



Desh.^yes. MS. in OuniingV Colleeticni. 



Hah. Isl.St. Thonuis. 



A rath( 



■uneitorm specie,^, 

 Si) named. 



lut more depressed 



