MOLLUSCA. 56s 



obliquely truncate, the cardinal portion rapidly sloping with a 

 slight curvature to^ the extremity of the moderately sized liga- 

 ment ; hinge line short and oblique to the axis of the shell. Um- 

 bonal angle distinct but not marked, and the cardinal slope nar- 

 row and rather abrupt. Surface marked only by fine concentric 

 striae, which appear to have been confined principally to the epi- 

 dermal layer." (Whitfield.) 



Formation and locality. — Raritan clay, near Woodbridge. 



Geographic distribution. — New Jersey. 



Supet-family CARDITACEA. 



Family OARDITIDAE. 



Genus Cardita Bruguiere. 



Cardita intermedia Whitfield. 



Plate LXIL, Figs. 6-8. 



1886. Cardita intermedia Whitf., Pal. N. J., vol. i (Monog. 

 U. S. G. S., vol. 9), p. 209, pi. 28, figs. 14-15. 



Description. — The dimensions of the type specimen are : length, 

 20 mm.; height, 17 mm.; thickness, 12.5 mm. Shell subovate 

 in outline exclusive of the beaks, broadest posteriorly. The beaks 

 large and prominent in the casts, considerably elevated above the 

 hinge-line, situated in front of the middle, inclined forward. 

 Hinge-line arcuate; anterior margin narrowly rounded; basal 

 margin strongly convex; posterior margin broiadly rounded. 

 Valves ventricose; the muscular scars rather small but distinct. 

 Shell marked by 10 or 12 rather strong radiating ribs whose 

 presence is shown in the casts only along the ventral border be- 

 tween the twO' muscular scars. 



Remarks. — This species has not been certainly met with in the 

 recent ooUections, the above description being based upon Whit- 

 field's figure and description and the type specimen which is pre- 

 served in the collection of Columbia University. 



Pormation and locality. — ? Vincentown sand, near Deal ( 122) ; 

 Manasquan marl, Farmingdale (Whitfield.) 



Geographic distribution. — New Jersey. 



