PLATE CXLIL 



MYA GLYCYMERIS. 



LARGE MY A. 



GENERIC CHARACTER. 



Animal Ascidia. Shell bivalve, gaping in general at one extremity : 

 hinge with a thick patulous tooth ; seldom more than one, and that 

 not inserted into the opposite valve. 



SPECIFIC CHARACTER 



AND 



SYNONYMS. 



Shell gaping at both ends : very thick, lamellous oblong-oval, with 

 transverse rugose striae : first tooth of the hinge very thick. 



My A Glycymeris : testa utrinque hiante crassissima lamellata ob- 



longo ovata transverse striato rugosa, cardinis 

 dente primario crassissimo, Gmel. Sj/st. Nat. 

 p. 3222. sp. 17. 



Mya Glycymeris : testa sub-ovata oblonga, ponderosa, ventricosa, 



utrinque hians, antice et postice quasi oblique 

 truncata, dente cardinali crassissimo. Chtmn. 

 T. 6. p. 33. 



Telline beante, Fa-cart D'Herbigny. Did. T. 3. p. 358. 



List. n. Conch. 6. t. Z.f. 25. Bom. t. \.f. 8. 

 H 4 



