NORTH-CAROLINA GEOLOGICAL SURVEY. 



307 



FIG. 240-'l. 



Found in the miocene beds. Four views, #, Echinus Ruf- 

 finii, viewed from above ; 5, mouth ; c, spinegerous tubercles ; 

 d, ambulacral plates, and arrangement of pores : #, J, natural 

 size, <?, dj enlarged. 



FAMILY CLYPEASTARIDAE. ECHINOLAMPAS APPENDICULATUS. N. S. 



(Fig. 240-'l.) 



Test thin; body oval, depressed; 

 margin thick or rounded ; somewhat 

 elongated, wider anteriorly than pos- 

 teriorly ; ambulacra narrow, open at 

 their extremities ; sub-petaloid ; pores 

 connected by furrows ; mouth trans- 

 verse ; excretory orifice horizontal, 

 marginal ; inadriporiform plate ex- 

 centric ; apical disk occupied by a 

 sub-cordate sculptured plate, furnish- 

 ed with a pentangula opening, in the 

 centre of which there is a pore ; are- 

 olse more numerous below than above 

 area around the mouth inflected. 



ECHINOCYAMUS PARVUS. N. S. (Fig. 



Test small, oval, with rounded sides; avenues dorsal; 



mouth sub-central, rounded, large, with a crenulated margin; 



vent between the mouth and hinder margin ; genital 



FIO. 244. p 0res apparently four. Figure natural size. The 



7} mouth is large in proportion to the size of the body 



arid the vent is situated half way between the mouth 



and margin. Eocene of Craven. 



