NO. 5 TERTIARY ECHINOIDS FROM FLORIDA — KIER 49 



greatest width at midlength or posterior to midlength ; margin usually 

 slightly angular but in some specimens smooth, anterior, posterior 

 slightly truncated; heights variable, some specimens considerably 

 higher than others with height varying from 44 to 58 percent of the 

 height, larger specimens usually slightly lower than smaller (text 

 fig- 48 ) 5 greatest height central to slightly anterior, usually at apical 

 system; sides gently curving, in some specimens curving sharply at 

 margin; adoral surface concave. 



80i 



70 ♦+ ♦ ♦♦ ♦ 



60 



uj50 



^40 



e 30 



5 



20 



10- 



10 20 30 40 50 60 70 80 90 100 



LENGTH IN MILLIMETERS 



Fig. 47. — Rhyncholampas evergladensis (Mansfield). Width of the test rela- 

 tive to the length. 



Apical system. — Anterior, four genital pores, compact (pi. 17, 

 fig. 3). 



Ambulacra. — Petals well developed, broad, with greatest width 

 one-third distance from apical system to end of petal, petals of ap- 

 proximately equal length, petals II, IV wider than other petals, petal 

 III narrower ; poriferous zones of unequal length, one to three more 

 pore-pairs in right poriferous zones of petal III, posterior poriferous 

 zones of petals II, IV, anterior poriferous zones of petals V, I ; num- 



