NO, 3 CASSIDULOID ECHINOIDS — KIER 203 



Genus SANTEELAMPAS Cooke 



Santeclampas Cooke, 1959. Geol. Surv. Prof. Pap. 321, p. 61. Type species by 

 original designation, Catopygiis oviformis Conrad. 



GENERIC DESCRIPTION 



Medium size, elongate, highly inflated, apical system monobasal, 

 very eccentric anteriorly ; petals straight, narrow, open, pores con- 

 jugate, poriferous zones in same petal of equal length, ambulacral 

 plates beyond petals single pored ; periproct marginal, longitudinal ; 

 peristome pentagonal higher than wide ; bourrelets well developed, 

 phyllodes single pored, broad, pores in two series in each half- 

 ambulacrum, few in inner series ; no naked zone in interambulacrum 

 5 adorally. 



Comparison zvith other genera. — Santeclampas is similar to Gito- 

 lampas in its peristome, floscelle, and position and shape of its 

 periproct, but differs in having narrower, open petals, and a narrower, 

 more inflated test. It is similar to some species of PUolampas in the 

 shape of its test, but differs in having narrower poriferous zones in 

 its petals and a wider than high peristome. It is distinguished from 

 Echinolampas by its petals with poriferous zones of equal length in 

 the same petal, and longitudinal periproct. 



Range and distribution. — Middle Eocene of eastern United States. 



DESCRIPTION OF TYPE SPECIES 

 SANTEELAMPAS OVIFORMIS (Conrad) 



Plate 38, figures 7-10; text figure 168 



Catopygiis oviformis Conrad, 1850. Journ. Acad. Nat. Sci. Philadelphia, ser. 2, 

 vol. 2, p. 39, Pl- I, fig- 15- 



Material. — Holotype and one other specimen studied. 



Shape. — Medium size, elongate, highly inflated, greatest width and 

 height posterior to center, anterior margin smoothly rounded, pos- 

 terior pointed when viewed from above, slightly truncated from 

 below, with posterior margin tilted; sides smoothly rounded, adoral 

 surface slightly depressed at peristome. 



Apical system. — Very eccentric anteriorly, monobasal, four genital 

 pores. 



Ambulacra. — Petals narrow, long, open, petal III shorter than 

 others, petals V and I longest; poriferous zones narrow, of equal 

 length in same petal, pores conjugate, inner round, outer slightly 

 elongated obliquely; interporiferous zones slightly less than twice 



