212 TRANS. OF THE ACAD. OF SCIENCE. 
extremity, which is rounded ; buccal margin very short, round- 
ed; I esas margin straight, or very slightly sinuate; um- 
exsredhicy and imiewhie Feepsty to superior an neve 
edges; beaks small, ve slightly elevated, sitnated a short 
distance from. extremity ; arked with numerous 
mate, curved, pallatih 
Dimensions. Lely 1B ‘height, .27; thickness, .18. 
This species is very analagous to Mytilus Pallasi Verneuil, 
e Russian 
species, cpidiee! some o M. de te Vee. nee aes one o¢- 
Soaps p the or four. 
Geol. and Loc.—Upper Coal Measures. : 
Sie by Major “Hawn from — of Verdigris _ 
fu | Myauma RECTA, Shumard. ~ 
t it ok the fin 
poste a ‘The 
