OF THE UNITED STATES. 75 



Echinus, Lam. 



E. infulatus, (S. G. M.) PI. x, fig. 7. 



Specific character. Having five pairs of tubercles running 

 from the mouth to the apex ; as they approach the latter con- 

 verging and becoming smaller: intermediate between each 

 pair of tubercles are four other rows, commencing at the 

 mouth and terminating just above the margin. 



Diameter, three-fourths of an inch. 



Found by Mr. Conrad' in the calcareous strata of South 

 Carolina. 



Cidarites, Lam., Goldf. 



C. diatretum, (S. G. M.) PI. x, fig. 10. 



This beautiful species, of which I found in the lime- 

 stone of Gloucester, New Jersey, a solitary specimen, is 

 about three-fourths of an inch in diameter, and much 

 compressed. 



Nucleolites, Lam., Goldf. 



N. crucifer, (S. G. M.) PI. iii, fig. 15. 



Amer. Journ. Science, vol. xviii, pi. iii, fig. 8. 



Specific character. Ovoidal, compressed, with five ambu- 

 lacra, each composed of two nearly parallel lines, and an insu- 

 lated line between each pair of ambulacra ; mouth sub-central ; 

 margin rounded. 



Length, from half an inch to an inch. . 



Common in the calcareous strata of New Jersey. 



In the former edition this fossil was placed under the 

 genus Ananchytes. 



