NORTH-CAROLINA GEOLOGICAL SURVEY, 



309 



FAMILY SPATANGIDAE GONIOCLYPEUS SUBANGULATUS. N. G. 



(Fig. 242.) 



Test thick, sub-conical, covered with small spines, anterior 

 and posterior areas somewhat unequal; margin and base 



FIQ. 242. 



FIG. 243. 



somewhat pentangular; posterior or anal orifice lateral, or 

 upon the superior face ; interarnbulacral area grooved, with 

 the continued area beneath projecting ; interanibulacral areas 

 sub-angulated; mouth rather narrow or small, central; peris- 

 tome angular, and surrounded by five angular prominences, 

 which terminate in the interambulacral areas, between which 

 is a rosette, perforated by seven pairs of pores, with three odd 

 ones at the end of each petal ; ambulacra petaloid and closed ; 

 the prolonged zone provided with alternating pores as far as 

 the base ; pores connected by oblique grooves ; interambu 

 lacral wide ; plates large, and nine or ten in a column. 

 Figure 243, rosette enlarged. 



OBSERVATIONS. The ambulacral areas are narrow, but the 

 poriferous zones are rather wide ; and the interambulacral 

 areas are about four times as wide as the ambulacral. The 

 genital plates are indeterminate, but the pores are large and 

 the occular small, and appear to be mere indentations ; buc- 

 cal area ornamented with a rosette ; petals transversely 

 wrinkled ; pores elongated ; the anterior lateral plates appear 

 to have eleven pairs of pores instead of seven. The genus is 

 closely related to Cassidulus of Lamark, but the pores are 

 united by grooves. Eocene, Wardsworth marl, Craven co. 



