NO. 5 TERTIARY ECHINOIDS FROM FLORIDA — KIER 37 



Peristome. — Anterior, small opening, subcircular; food grooves 

 bifurcating near peristome, one or two lateral branches to each groove. 



Adoral plate arrangement. — Basicoronal plates small (text fig. 35), 

 interambulacral plates larger than ambulacral, posterior interambu- 

 lacral plate considerably larger than others ; paired interambulacra 











o 









o 





110- 







o 





100 







o 



Oo 



o o 





90- 







oo 









(f) 80- 







o 





ce 







+ 



o o 





LJ 











fci 70 " 







+ 





2 







o. 





3 60- 







+ 



o 





_j 











S 50- 







°c* 





2 







o 





x 40- 







o 

 o 





h- 







+ 





Q _~ 







+ 





^ 30- 











20- 





o 







10- 



o 



o 



o ENCORE TAMiAMIENSIS Mansfield 

 + ENCORE MACROPHORA(Ravenel) 





10 20 30 40 50 60 70 80 90 100 110 120 

 LENGTH IN MILLIMETERS 



Fig. 31. — Encope tamiamiensis Mansfield, Encope macrophora (Ravenel). 

 Width of test relative to length of test. 



separated from basicoronal plates by first pair of postbasicoronal am- 

 bulacral plates ; posterior interambulacrum in contact with basicoronal 

 plate; interambulacra with 3 or 4 postbasicoronal plates in each 

 column ; ambulacra with 6 or 7 postbasicoronal plates to each column. 

 Growth. — On the smallest specimen, 7.6 mm long, the posterior 

 notches are very slightly developed and there are no anterior notches. 

 The posterior lunule is very small. The first anterior notches occur 

 in a specimen 14.2 mm long, where they are only slightly developed. 



