O'J 



PSAMMOBIA. AuctonwL 



Gen. Char. A transverse, elliptical, or ovato 

 oblong, bivalve ; depressed, slightly gaping 

 at the sides ; beaks not incurved ; hinge 

 furnished with two teeth in the right valve, 

 and one in the other. 



ill GENUS nearly related to Tellina, but distinguished by 

 the absence of lateral teeth in the hinge : some species 

 have a general curvature of the valves to one side, but 

 not the irregular twist in the margin peculiar to Tellina ; 

 many of the species are prettily marked, and most of 

 them are furnished with an epidermis. There are three 

 internal impressions from the attachment of muscles, one 

 of them irregular and small is placed near the beak ; there 

 is also a deep sinus in the line to which the mantle was 

 attached ; one tooth in each valve is commonly bifid. 

 The recent species are inhabitants of the sea in various 

 latitudes. 



PSAMMOBIA solida. 



TAB. CCCXLII. 



Spec. Char. Transversely elongated, depressed, 

 tumid, nearly smooth, slightly curved ; an 

 obtuse carina marks the anterior side. 



r^ EARLY twice as wide as long : a thick bluntly shaped 

 shell, with a slight oblique truncation upon the anterior 

 extremity ; it is more gibbose or tumid, although upon 

 tlie whole not deeper than P. Ferroensis, which it some- 



