NO. 3 CASSIDULOID ECHINOIDS — KIER 7 1 



DESCRirnON OF TYPE SPECIES 



CLYPEOPYGUS PAULTREI (Cotteau) 



Plate 13, figure 9; text figure 52 

 Clypens paultrei Cotteau, 1851. Bull. Soc. Sci. Hist. Nat. Yonne, vol. 5, p. 291. 



Material. — I was able to find only one specimen of this species in 

 Europe, and that one was in the Lambert Collection at the Sorbonne, 

 Paris. Unfortunately, this specimen is not well preserved. 



Shape. — Medium size (Cotteau's, 1859, pi. 57, figs. 8-1 1, figured 

 specimen 55 mm. long), very depressed with adapical surface flat- 

 tened, adoral depressed ; marginal outline elongate, slight anterior 

 notch, greatest width posterior to center. 



Apical system. — Anterior, tetrabasal, posterior genital plates not 

 in contact, separated by genital 2. 



Ambulacra. — Petals broad, equal, flush, straight, open or with 

 very slight tendency to close distally. Poriferous zones tapering 

 distally, pores conjugate, outer pore elongated transversely, slitlike; 

 inner pore round. 



Periproct. — Supramarginal, in triangular notch with flat floor 

 extending to posterior margin ; periproct opening between one-half 

 and two-thirds distance from apical system to posterior margin. 



Peristome. — Anterior, pentagonal, width equal to height, depressed. 



r lose die. — Bourrelets strongly developed, inflated ; phyllodes broad, 

 double pored (text fig. 52), with pore pairs arranged in two series 

 in each half -ambulacrum, looplike in arrangement, approximately 

 10 pore pairs in each outer series, 5 in each inner ; no buccal pores. 



Occurrence. — Lower Cretaceous (Neocomian), Saint-Sauveur, 

 Marolles, Yonne, France. 



Location of type specimen. — According to Cotteau (1859, P- 94) > 

 the type specimen was in his collection in the ficole des Mines, Paris. 



Genus CATOPYGUS L. Agassiz 



Catopygus L. Agassiz, 1836b. Prod, monogr. radiaires, p. 185. Type species by 

 subsequent designation, Cotteau, 1869, Pal. franc, Jur., p. 121, Nncleolites 

 carinatiis Goldfuss, 1826. 



Synonym : Pcncsticta Poniel. 



GENERIC DESCRIPTION 



Small, oval, highly inflated adapically, usually with slightly pointed 

 posterior margin ; flat or slightly convex adorally ; apical system 



