NO. 3 CASSIDULOID ECHINOIDS — KIER I43 



GENERIC DESCRIPTION 



Small, flattened; apical system central, tetrabasal; petals equal, 

 broad, closed, wide interporiferous and poriferous zones; pores con- 

 jugate, outer pore slitlike, ambulacral plates single pored beyond 

 petals ; periproct supramarginal, very broad, with groove extending 

 to posterior margin; peristome anterior; bourrelets strongly devel- 

 oped, pointed, toothlike; phyllodes unknown but probably single 

 pored. 



Comparison with other genera. — Faiiraster is similar to Faujasia 

 in having short, closed, equal, petals, a flat adoral surface, and tooth- 

 like bourrelets, but is easily distinguished from it by its supramarginal 

 rather than inframarginal periproct, and by its more flattened test. 

 Faiiraster and Hardouinia have similar petals, a supramarginal peri- 

 proct, and toothlike bourrelets, but the test in Hardouinia is much 

 more elevated. 



Range. — Upper Cretaceous (]Maestrichtian) of Spain — only one 

 species known. 



DESCRIPTION OF TYPE SPECIES 



FAURASTER PRISCUS Lambert 

 Plate 18, figures 6-8 



Faiiraster priscus Lambert, in Lambert and Thiery, 1924. Ess. nom. rais., 

 pp. 396-397. Described and figured in Lambert, 1927, pp. 39, 40, pi. 3, figs. 

 1-4. 



Material. — One specimen, the holotype, was studied. This speci- 

 men is very poorly preserved, being fractured and partly covered 

 with matrix, and is evidently the only specimen known of this species. 



Shape. — Small, holotype 23 mm. long, test greatly flattened with 

 sharp margins; marginal outline angularly circular with width ap- 

 proximately equal to length ; adoral surface flat. 



Apical system. — Central, tetrabasal. 



Ambulacra. — Petals equal length, short, extending slightly more 

 than half distance to margin, closed, broad with broad tapering inter- 

 poriferous zones, and broad poriferous zones nearly as wide as inter- 

 poriferous zones ; conjugate with outer pore slitlike, inner pore 

 elongated transversely. 



Periproct. — Supramarginal, very wide and low, dorsally overhung 

 by upper surface, with flat, broad groove extending from ventral 

 edge of opening to posterior margin. 



Peristome. — Anterior, small, no other details visible. 



