PLATE LXIIL 



ARCA NUCLEUS. 



SILVERY ARK. 



GENERIC CHARACTER, 



Animal Tethys ? Shell bivalve, equivalve. Teeth of the hinge 

 numerous, inserted between each other. 



SPECIFIC CHARACTER 



AND 



SYNONYMS. 



Small, somewhat triangular, smooth, silvery within. Hinge semi- 

 circular, beset with numerous plate-like teeth. Margin finely ere* 

 nated. 



Arc a Nucleus : testa oblique ovata laeviuscula, natibus incurvis, 

 margine crenulato, cardine arcuato. Linn. Si/ si. 

 Nat. p. 1143. No. 184. 



Arc a Nucleus : testa oblique ovata laeviuscula : cardine triangulari. 

 Gmel. Linn. Syst. Nat. p. 3314. sp. 38. 



Tellina inaequilatera, margine interno minutissime dentato, sed prope 

 cardinem denticulis spissis, elatoribus, acutis, con- 

 spicua, oleagina, intus argentea. Gualt 1 . 

 Conch, tab. 81, fig. R. 

 G 2 



