321 



Bulletin 5 51 



FOSSIL SHELLS. HS 



TEIvLINA. 



T. cEquistriata. PI. x. fig. 7. Shell transversely 

 ovate-orbicular, with an elevated line or fold on 

 the anterior margin : surface with fine, somewhat 

 elevated, concentric, nearly equal, numerous striae, 

 forming grooves between them : apex nearly cen- 

 tral, acute : cardinal teeth deeply grooved : lateral 

 teeth two ; edge within, simple. 



Length seven-tenths, breadth nineteen -twenti- 

 eths of an inch. 



In general outline, this species has a resem- 

 blance to T. ostracea, Lam. In one specimen the 

 apex is central, and in another it is placed before 

 the middle. 



LUCINA. 



I. L. contracta. PI. x. fig. 8. Shell convex, 

 suborbicular, with numerous concentric, regular, 

 equidistant, elevated, membranaceous striae, and 

 intermediate smaller transverse lines : umbones not 

 very prominent : apices proximate, nearly central : 

 anterior hinge margin rectilinear, to an obtuse an- 

 gle near the middle of the anterior margin : ante- ■ 

 rior suhnargin with a very slightly impressed 

 line : posterior margin rounded : cardinal teeth 

 one in the left valve, and two in the right, the 

 posterior one of which is subbifid at tip : lateral 



VOL. IV. — NOVEMBER, 1824. 19 



[J. A. N. S., Phila., ist Ser., VoL IV, 1824.] 



