44 



THRACIA DECLIVIS. 

 Tab. IX, Jig. 2. 



SPECIFIC CHARACTER. 



Shell short subovate, anterior margin obtusely 

 rounded j posterior side sinuous ; the superior margin 

 nearly rectilinear, with a submarginal carinated line ; 

 extremity truncated ; surface with coarse concentric 

 lines ; beaks subcentral, slightly prominent, very thin 

 at the apex. 



SYNONYMES. 



Mya DECLIVIS, Pennant, British Zoology, vol. 4, 



p. 79. 

 LiGULA PUBESCENS, Montagu, Test. p. 40. 

 Mya convexa. Wood, Conch, p. 92, t. IS, Jig. 1. 

 Anatina myalis, La?n. Jin. sans. vert. vol. 5, p. 



464. 

 Thracia corbuloides? Blain. Mai. p. 563, pi. 76, 

 fig' 7. 



observations. 



This species has hitherto been found only on the 

 coast of the eastern states, on this side of the Atlantic ; 

 it inhabits the shores of Great Britain and the He- 



