LAMELLIBEANCHIATA OP THE LOWER MAELS. 133 



stices crossed by prominent lines. Locality — Haddonfield, N. J." I have 

 seen only a few casts and one or two impressions of this shell in iron-stone 

 nodnles from Keyport, N. J. The shell is minute, scarcely measuring 

 more than an eighth of an inch in diameter, erect with rather prominent 

 pointed beaks. Outline somewhat circular, or a little higher than wide, 

 ventricose, and with from eighteen to twenty or twenty -two prominent ribs, 

 which are most prominent on the anterior parts of the shell. I have not 

 been able to see fully the hinge characters, but there is evidence of a single 

 strong tooth beneath the beaks. The general aspect of the shell, however, 

 is more that of Cardita than of Cardium* 



Formation and locality. — In the iron-stone nodules found in clays at 

 Keyport and vicinity, associated with Inoceramus, Scapharca, Pteria, Cymella, 

 and other Cretaceous shells. 



Cardium Ripleyense Conrad. 

 (Jour. A. N. Sci., Phil., Vol. Ill, p. 326.) 



This species is not cited from any locality, nor is it figured in any 

 place so far as I can ascertain. The species according to the original 

 description would fall under the division Criocardium Conrad, if accepted, 

 so would not be quite a synonym of Cardium Ripleyanimi Conrad, herein 

 described. Mr. Conrad's description of the present species is as follows: 

 "A small cordate species, with minute equal radii, between each of which 

 is a series of comparatively long hair-like spines." I have seen no specimens 

 which will answer to these characters. 



Genus CRIOCARDIUM Conrad, 1870. 



Cardium (Criocardium) dumosum. 



Plate XX, Figs. 9-13. 



Cardium dumosum Conrad. Am, Jour. Conch., Vol. VI, p. 75. 

 Criocardium dumosum Conrad. Am. Jour. Conch., Vol. VI, p. 75. 



Shell of medium size, ventricose, with moderately large erect beaks, 

 strongly enrolled. Shell but httle oblique and very broadly ovate in outline, 



* Siuce writing the above I have seen a single imperfect valve of this species from Haddonfield, 

 N. J., preserving some of the shell. The characters are exactly as those given above, while the concen- 

 tric lines crossing the ribs are much stronger, forming minute lamellae, but not spines in any sense of 

 the word. 



