50 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 145 



ber of pores variable, specimens 80 mm long having from 44 to 53 

 pore-pairs in posterior poriferous zone of petal II or IV ; fewer 

 pores in smaller specimens with 37 pore-pairs in posterior porifer- 

 ous zone of petal II of specimen 35 mm long, very few pore-pairs 

 added in specimens over 70 mm long (text fig. 49) ; single pores in 

 ambulacral plates beyond petals. 



Periproct. — Supermarginal, wider than high, shallow grove extend- 

 ing from opening to posterior margin. 



60 1 



50 



£40 



m 



s 



_i 



S30 



S220 



JO 



*♦«* * ♦" 



JO" 20 30 40 50 60 70 60 80 100 



LENGTH IN MILLIMETERS 



Fig. 48. — Rhyncholampas evergladensts (Mansfield). Height of the test rela- 

 tive to the length. 



Peristome. — Anterior, pentagonal, depressed, wider than high. 



Floscelle. — Phyllodes well developed, broad (text fig. 50), approxi- 

 mately 34-37 pores in each phyllode, 11 or 12 in each outer series, 

 5-7 irregularly arranged in each inner series ; approximately same 

 number in smallest specimen preserving phyllode (40 mm long) as 

 in largest (90 mm long). Buccal pores present. Bour relets very 

 prominent, pointed. 



Tuberculation. — Tubercles adorally much larger than adapically, 

 naked granular zone in median area of interambulacrum V and 

 ambulacrum III adorally. 



Comparison with other species. — This species is distinguished from 

 R. ayresi Kier by its more pointed adapical surface, more gently 

 sloping sides, and more angular marginal outline. Its adoral surface 



