﻿MYA.— Plate I. 



Species i. (Mas. Sowerby.) 

 MvA TUUNCATA. ATi/a tisid obloiigd, vcntricosa, iirciju- 

 lanter rngata, post ice late hianti ; latere anlico 

 vald'e injtato, oUiqu'e tumido, margine dorsali elevatn, 

 umhunibus angulatis, proinineiitibus, rctrorsis, 

 latere post ico angustato ; iiianjiiie dorsali dcpresso, 

 margine tenninali triinrato. 

 The thuncated Mva. Hhtll oblong, ventricose, 



irregularly wrinkled, posteriorly broadly gaping ; 

 anterior side much inflated, obliquely tumid, 

 dorsal margin elevated, umboes angular, promi- 

 nent, leaning backwards, posterior side narrow ; 

 dorsal margin depressed, terminal margin trun- 

 cated. 



LiNN.EUS. Systema Naturae. 



llab. Coasts of Great Bvicaiu, 



