238 PALEONTOLOGY OF NEW JEKSEY. 



of the beaks. Surface of the valves as seen in casts only moderately con- 

 vex, and marked by fine, even lines of growth parallel to the margin of 

 the valve. Muscular imprints very faint. Pallial line too indistinct to be 

 described with certainty, but the best evidence furnished would indicate 

 that it was not very deep and rounded at the extremity. Hinge structure 

 not determined. 



This I suppose to be the shell which Mr. Conrad describes as Canjatis 

 Delmvarensis (Gabb's sp.) in the American Journal of Conchology, and of 

 which he says he was fortunate enoug-h to obtain the mold of a hinofe, 

 'Svliich proves^it to be a CaryatisJ^ I have not been able to obtain speci- 

 mens showing the hinge features, so shall accept his generic reference with- 

 out question. He, in common with others, had identified this as Cyprina 

 Morrissi Sowerby, an English Lower Eocene species. Mr. Gabb's Dione 

 Delawarensis is, I think, a distinct species from this one, being of a more reg- 

 ularly oval form, with narrower anterior and posterior extremities, a larger 

 and more prominent beak, which is placed much farther from the anterior 

 end of the shell, and is more erect than that of this one. It also occurs in 

 the Lower Marls of the Cretaceous system, and I have not seen a specimen 

 from the Eocene beds which I should be willing to consider as the same 

 with those. 



Formation and locality. — In the light-colored clay layers known as the 

 Stony Marls, at the top of the Upper Beds of Marls, characterized by Eocene 

 fossils, at Shark River, Squankum, and near Farmingdale, New Jersey. 



MACTRIDJ^.. 



Genus YELEDA Conrad. 1871. 



(Am. Jour. Concli., Vol. YI, p. 74.) 



Veleda equilatera, n. sp. 

 Plate XXX, Fig. 17. 



Shell very small, transversely elliptical in outline, and nearly equi- 

 lateral; length a little less than twice the height, and both extremities some- 

 what pointed or narrowly rounded ; basal line broadly curved, arid the 



