ECHINODERMATA. 279 



face plates of a Pentaceros have been found by Clark. They are 

 so highly characteristic that their generic relations are clearly 

 apparent. As no other Cretaceous representatives of this genus 

 have been found in American deposits they are given a specific 

 name as they cannot be readily associated with any known Euro- 

 pean species. 



Pormation and locality. — Vincentown limesand, Vincentown 

 (Clark). 



Geographic distribution. — New Jersey. 



Class ECHINOIDEA. 



Sub-Class EUECHINOIDEA. 

 Order CIDAROIDA. 

 Family OIDARIDAE. 



Genus Cidaris Klein. 



Cidaris splendens (Morton). 



Plate VII., Figs. 1-9. 



1829. Cidaris (?) sp. Mort., Jour. Acad. Nat. Sci. Phil., ist 



ser., vol. 6, p. 123. 



1830. Echinus sp. Mort., Am. Jour. Sci., ist ser., vol. ,17, p. 287 ; 



vol. 18, pi. 3, figs. 12-13. 

 1834. Echinus Mort., Synop. Org. Rem. Cret. Gr. U. S., pi. 3, 

 figs. 16-17. 



1841. Cidarites splendeus Mort., Proc. Acad. Nat. Sci. Phil., 



vol. I, p. 132. 



1842. Cidarites armiger Mort., Jour. Acad. Nat. Sci. Phil., ist 



ser., vol. 8, p. 215, pi. 2, fig. i. 

 1859. Cidaris armiger Gabb, Cat. Inv. Foss. Cret. Form. U. S., 



p. 18. 

 1859. Cidaris splendens Gabb, Cat. Inv. Foss. Cret. Form. U. S., 



p. 18. 

 1891. Cidaris armiger Clark, Johns Hopkins Univ. Circ, vol. 



10, No. 87, p. 75. 

 1893. Cidaris splendens Clark, Johns Hopkins Univ. Circ, vol. 



12, No. 103, p. 51. 



