PLATE LXXXIL 



MYA DECLIVIS. 



SLOPING MYA, OR GAPER, 

 GENERIC CHARACTER. 



Animal an Ascidia. Shell bivalve gaping at one end. The hinge 

 for the most part furnished with a thick, strong, and broad tooth, not 

 inserted into the opposite valve. 



SPECIFIC CHARACTER 



ANO 



SYNONYMS. 



Shell somsvvhat oval, posterior end obliquely angulated. Tooth 

 ©f the hinge thick and scarcely prominent. 



Mya DECLIVIS ; testa subovali, postice oblique subangulata. Car- 

 dinis dente crasso vix prominente. 



MyA Declivis with a brittle, half transparent shell, with a hinge 

 slightly prominent ; less gaping than the truncata ; 

 near the open end sloping downwards. Penn. Br. 

 Zool. Vol 4:. p. 19. sp. 15. 



C 2 



