MOLLUSCA. 583 



1905. Cardium ripleyanum Johns., Proc. Acad. Nat Sci. Phil. 

 (1905), p. 15. 



Description. — The dimensions of an internal cast are : height, 

 4.5 mm. ; width, 4 mm. ; thickness, 3 mm. The height of one of 

 the largest individuals observed is 5.3 mm. Shell subcircular in 

 outline, slightly higher than wide, cordate in end view. Hinge- 

 line relatively long, a little arched ; anterior, basal, and posterior 

 margins rounded. Beaks rather prominent, elevated above the 

 hinge-line, incurved. Umbones prominent, the surface sloping 

 rather abruptly both in front and behind; shell compressed to- 

 wards the cardinal extremities, more so behind than in front. 

 Surface of the shell marked with about 22 subangular, radiating 

 ribs, slightly narrower than the interspaces, also by fine, con- 

 centric, sublamellose lines. 



Remarks. — This little species is not an uncommon member of 

 the Woodbury clay fauna, being less common in the Clififwood 

 and Merchantville. It was originally described from the Wood- 

 bury clay formation near Haddonfield. 



Formation, and locality. — Qififwood clay, . Cliffwood Point 

 (105), near Matawan (189); Merchantville clay, near James- 

 burg (139, 140, 141), Lenola (163) ; Woodbury clay, Lorillard 

 (102), near Matawan (103), near Haddonfield (183, 168, 165, 



164). 

 Geographic distribution. — New Jersey. 



Cardium spiilmani Conrad. 

 Plate LXIV., Figs. 9-11. 



1858. Cardium spiilmani Con., Jour. Acad. Nat. Sci. Phil., 2nd 



sen, vol. 3, p. 326, pi. 34, fig- 3- 

 1864. Cardium (Liocardium) spiilmani Meek, Check List Inr. 



Poss. N. A., Cret. and Jur., p. 13. 

 Cardiiim (Protocardiilm) perelongatum Whitf., Pal. N. 



J., vol. I (Monog. U. S. G. S., vol. 9), p. 136, pi. 20, 



figs. 20-21, pi. 21, figs. 4-5. 



