CONRAD'S DESCRIPTIONS OF NEW FOSSIL SHELLS OF THE U. S. 275 



PANOP^A. 



I'. DKCisA. PI. 24, fig. 19.— Oblong, ventricose, concentrically waved or furrowed; slightly contracted 

 posteriorly; posterior hinge line nearly parallel with the base; posterior margin truncated obliquely 

 inwards ; basal margin nearly straight ; beaks situated about one-third the shell's length from the anterior 

 margin. 



Locality. Burlington county, N. J., Mr. Budd. Chesapeake and Delaware canals, 

 Dr. Morton. 



ARCA. 



A. U.MOi'Sis. PI. 24, fig. 17. — Oblongo-rhomboidal, contracted in the middle; posterior hinge and basal 

 margins parallel; beaks situated about one-fourth the shell'slength from anterior extremity ; dorsal area 

 narrow; unibonal slope rounded. (A cast.) 



Locality. Burlington county, N. J. 



TELLTNA. 



T. DKNSATA. PI. 24, fig. 14. — Ovato-triangular, compressed? the right valve convex; the left nearly flat, 

 or a little piano convex anteriorly; posterior side reflected; anterior margin regularly rounded; poste- 

 rior subtruncated, direct. 



Locality. Burlington county, N. J., Mr. Budd. 



A cast of a large species, with the impression of the hinge representing large and 

 prominent teeth. 



LUCINA. 



L. piNnuis. PI. 24, fig. 18. — Suborbicular, ventricose; inequilateral; posterior margin truncated obliquely 

 inwards; basal margin subangulated posterior to the middle. 



Locality. New Jersey ? 



CARDIUM. 



C PKorKxruM. PI. 24, fig. 12. — Suboval or subtriangular, inequilateral, ventricose; ribs about 28 in 

 number, narrow, rounded, obsolete on the posterior submirgin; posterior extremity obliquely truncated; 

 beaks pi ominent ; basal margin rounded ; umbonal slope undefined ; posterior end gaping. (A cast.) 

 Locality. Burlington county, N. J. 



This beautiful species has an analogue in the European chalk, and is somewhat 

 similar in form to C. hiantulum, Ag. 



VENILIA? Morion. 



V. RHOMBOIDEA. PI. 24, fig. 7. — Rhomboidal ; cavity of valves profound ; sides concave; anterior side 

 very short ; umbo very prominent and curved as in Imcardia ; umbonal slope profoundly carinated ; 

 postcrii r slope concave,, depressed ; posterior margin rectilinear, oblique, biangulated; disk with two or 

 three wide shallow concentric furrows. (A cast.) 

 Locality. Burlington county, Mr. Budd. 



PECTEN. 



P. QUINQUENARIA. PI. 24, fig. lO.^Ovate, much compressed, with five distant ribs, broad and rounded on 

 one valve, narrow and subangulated on the opposite valve. (A cast.) 



Locality. Chesapeake and Delaware canal, Dr. Morton. 



