60 



side produced, with the margin rounded; lateral 

 teeth with regular transverse stride; the posterior 

 tooth elongated. 



SYNONYMES. 



Mactra deaurata, Turton, Conch. JnsuL Brit 



p.7l,pl5,fig.^. 

 Mactra arctata, nobis, Journ. Acad. JVat. 



Sciences, vol. 6, p. 257, pi. 11, Jig. 1. 



observations. 



This species has not been found south of Rhode 

 Island ; I hesitated to publish it as new, thinking it 

 might be the deaurata of Turton, whose description 

 of it, however, was so imperfect, that I could not 

 identify it. Subsequently, by reference to the beau- 

 tiful figure quoted above, I was satisfied of the iden- 

 tity. It possesses the delicate epidermis, reflecting a 

 metallic lustre, as described by Dr. Turton. 



MACTRA TELLINOIDES. 



Tab. XIV, ^^.2. 



SPECIFIC character. 



Shell ovate, thin, inflated, with numerous raised 

 concentric striae ; anterior end subcuneiform, slightly 



