132 



VKNERIDiE. 



Z)/oneco?!ye.xa, Deshayes, Br. Mus. Cat. (Biv.) 71 (18.5.3).- 



fig. 40. 

 Cytherca Sayana, Conkad, Silliin. Journ. xxiii. .34.5 (183.3) 



Reeve, Conch. Icon. pi. 10, 



Shell oval, rather thin, valves very convex, color a dead-white or 

 ■with a rnsty tinoe, usually chalky ; inequipartite, beaks elevated, 



curving forwards, in front ol" 

 which is a well-marked, heart- 

 shaped lunulc ; anterior ])art 

 about half the lenuth of the pos- 

 terior, compressed and some- 

 what ])ointed ; regularly round- 

 ed behind and at l)ase ; surface 

 marked with coarse lines of 

 growth, which are most regular 

 anteriorly ; ligament long, rather 

 sunken ; within milk-white, ])ol- 

 ished ; impressions superficial. 

 Length, one and tliree fourths 

 inches; height, one and one half inches; breadth, one inch nearly. 

 The animal has very long siphons, united throughout, translucent, 

 with white blotches near the end, more opaque and brownish near 

 the shell. 



A few specimens have been found on Chelsea Beach, Imt it is- 

 rare. It has been found about Rhode Island by Colonel Totten ; 

 and it has also been taken with the dredge l)y Drs. j\Iigliels and 

 Wood of Portland, in the harbor of that ])lace. Nahaiit Beach, 

 alive, sometimes abundant: Mailjlehcad Harl)or, dredged in seven 

 fathoms (^Haskell) ; Sable Island and Halifax, rare (Willis^. 



Mr. Say knew it only as a fossil, in which state it occurs in the 

 tertiary formation of Maryland. 



This is by no means an attractive shell, its dead-Avhite surface 

 leading one to regard it as some beach-worn specimen of C//prina, 

 or perhaps of Venus nnrccnaria. Its form, however, is proportion- 

 ally longer than the former, and somewhat longer than the latter ; 

 and it never attains to anything like the size of either of them. It 

 belongs to the genus Callista of Poll. 



Oeiitis VEl^lJS, Lin. 1758. 



Shell inequilateral, sub-ovate ; hinge with three diverging car- 

 dinal teeth in each valve ; pallial im])ression with a sinus. 



