PLATE CXXVI. 



MACTRA SUBTRUNCTA. 



SUBTRUNCATED MACTRA. 



GENERIC CHARACTER. 



Animal a Tethys. Bivalve, sides unequal. Middle tooth complicated^ 

 with a little groove on each side : lateral teeth remote. 



SPECIFIC CHARACTER 



AND 



SYNONYMS. 



Shell somewhat triangular, whitish, smooth, subtruncated o» 



each side. 



Mactra subtruncata : testa subtriangularis, albescens, laevis 



lateribus subtruncatis, 

 Trigonella albescens laevis, lateribus subtruncatis. Subtruncata. D& 



Cosja. Brit. Conch, p. 198; No, 34. 



A thick, strong, and heavy shell, of a somewhat triangular shape, 

 and much flattened on each side, obliquely from the beaks : the 

 valves rather convex, the beaks pointed strong, and turned inwards, 



E % 



