NO. 5 TERTIARY ECHINOIDS FROM FLORIDA — KIER 47 



irregularly arranged in each inner. Buccal pores present. Bourrelets 

 very prominent (pi. 16, fig. 6), pointed. 



Tuberculation. — Tubercles adorally much larger than adapically, 

 narrow naked granular zone (text fig. 43) in median area of inter- 

 ambulacrum 5 and ambulacrum III adorally. 



70 



60 



50j 



CO 



£C 

 UJ 

 f- 

 Ul 



140] 



530- 



V- 



X 



o 



UJ 



x20 



10 



*■% 



10 20 30 40 50 60 70 80 



LENGTH IN MILLIMETERS 



Fig. 45. — Rhyncholampas ayresi Kier, new species. Height relative to length 



of test. 



Comparison. — This species is distinguished from Rhyncholampas 

 evergladensis by having more of its adapical surface inflated, by its 

 steeper sloping sides, less pointed adapical surface, and less angular 

 marginal outline. The adoral surface in R. ayresi is less depressed, 

 the naked zone in interambulacrum 5 is narrower (text fig. 43), 

 and phyllode III is narrower. 



Remarks. — The specimens from South Carolina that Cooke (1959, 

 pi. 23, figs. 8-14) referred to Cassidulus sabistonensis Kellum seem 

 to be intermediate between R. ayresi and R. evergladensis. Further 

 study is necessary before these specimens can be definitely assigned. 



