no. 5 



TERTIARY ECHINOIDS FROM FLORIDA — KIER 



45 



son, 1960 pp. 66-67), permitting migration from the Panamic to the 

 Caribbean area or vice versa." 



Occurrence. — Tamiami formation (barnacle-echinoid-oyster fa- 

 des), loc. 27. 



Types.— Holotype, U.S.N.M. 648136; figured specimens, U.S.N.M. 

 648189-648193. 



RHYNCHOLAMPAS AYRESI Kier, new species 



Plate 16, figures 3-6 ; text figures 43-46 



Diagnosis. — Species characterized by highly inflated adapical sur- 

 face, steep sides, smooth marginal outline, narrow naked zone in 

 interambulacrum 5, narrow phyllode III. 



42 43 



Figs. 42, 43. — Rhyncholampas evergladensis (Mansfield) : 42, Adoral view of 

 U.S.N.M. 648148, from the Tamiami formation, loc. 9 ; 43, Rhyncholampas ayresi 

 Kier, new species: Adoral view of U.S.N.M. 648160, from the Caloosahatchee 

 formation, loc. 6. These two drawings show the difference in the width of the 

 naked zones in ambulacrum III and interambulacrum 5. 



Material. — Twenty-seven specimens. 



Shape. — Varying in length from 54 to 65 mm, average 63 mm, in 

 smaller specimens width approximately 85 percent of length, in larger 

 90 percent of length (text fig. 44) with greatest width posterior to 

 center (text fig. 43) ; adapical surface highly inflated with steeply 

 sloping sides, height averaging 55 percent of length (text fig. 45) ; 

 adoral surface flat or in few specimens slightly depressed around 

 peristome. 



