98 CO^CBYLIA—DITHYRA. 27. 



Seopula, PsAMMOBiA testd reniformi, latere antico bifaridm striato, dentibus 

 15. . ^ ' J 



erectis. 

 Shell kidney-shaped, striate in two directions on the anterior side, 

 with all the teeth erect. 



Tab nost. 6, fig. 11 and 12. 

 Chemnitz, xi. p. 203, tab. 198, fig. 1983. 

 Mus. nost. Dredged near Exmouth. 



Shell three eights of an inch long, and as much again in breadth, 

 clear glossy white inside and outside resembling the last in its 

 markings, but is distinguished by the following particulars, in- 

 dejoendent of the size. 



The sides are more open, where the valves are a little reflected : 

 in the middle there is an evident contraction giving it a kidney-like 

 form : the oblique striije are not more than twenty in number, ex- 

 tending over about half the surface : the beaks are more prominent ; 

 and the teeth most essentially distinguish it from the young 

 of the last, all of them being erect and close together, one subulate 

 and a little recurved, the other flat. 



27. TELLINA- L/iViVE. 



Testa transversa vel suborbicularis, planiuscula, inaquilateralis, latere 

 anticO flexuoso-plicato. Cardo dentibus subbinis : lateralibus sapi 

 [ remotis. Ligamentum externum, ad latus brevius. 



