PLATE CXXVL 



MACTRA SUBTRUNCtA, 



SUBTRUNCATED MACTRA. 



GENERIC CHARACIER. 



Animal a Tetliys. 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, subtruncatcd oiJ 



each side. 



Mactra subtruncata : testa subtriaiigularis, albescens, laevia 



lateribus subtruncatis. 

 Trigonella albescens Isevis, lateribus subtruncatis. Subtruncata. Dd 



Costa. Brit. Conch, p. 19S. 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* 



i: 2 



