594 



NORTH AMERICAN INDEX FOSSILS. 



of southern United States and Mexico, in its more orbicular form, 

 more regular convex upper surface, smaller lunules, with slight 

 depression extending to the margin, and less branched ambulacra! 

 furrows on under side. 



Pliocenic marls of South Carolina, etc. 



XXIII. Encope Agassiz. 

 Larger and thicker than Mellita, more or less subpentahedral, 

 with broad notch or lunule in median line of each ambulacrum, 

 and large lunule in posterior interambulacrum. Pliocenic to 

 Recent. 



36. E. macrophora Ravenel. (Fig. 1927.) Pliocenic. 



Large ; posterior lunule broad and surrounded by elevated rim ; 



posterior end gently rounded, not notched; marginal notches shal- 



FlG. 1927. Encope macropkcra, lateral and dorsal views. Natural size. 

 (After McCrady.) 



low, posterior lateral pair deepest ; periproct on proximal slope of 

 posterior lunule. Related to recent E. grandis Agassiz of Lower 

 California coast. 



Pliocenic marls of South Carolina. 



