NO. 3 CASSIDULOID ECHINOIDS — KIER II9 



DESCRIPTION OF TYPE SPECIES 



CONOLAMPAS SIGSBEI (A. Agassiz) 



Plate 34, figures 8, 9 



Conoclypus sigsbei A. Agassiz, 1878. Bull, Mus. Comp. Zool., vol. 5, p. 190, 

 pis. I, 2. 



Material. — Many specimens studied at the Museum of Compara- 

 tive Zoology, Harvard, and one in the U. S. National Museum. 



Shape. — Very large, circular in marginal outline, very high, adoral 

 surface flat. 



Apical system. — Central, monobasal. 



Ambulacra. — Petals long, straight, extending almost to margin, 

 broad with interporiferous zones three to four times width of porifer- 

 ous zones, petals with no tendency to close distally; poriferous zones 

 narrow with pore equal, round, not conjugate or just slightly con- 

 jugate ; zones of unequal length, more pore pairs in right zone of 

 petal III, posterior zones of petals II and IV, and outer zones of 

 V and I. 



Periproct. — Inframarginal, transverse. 



Peristome. — Central to slightly posterior, pentagonal, transverse. 



Floscelle. — Bourrelets well developed, inflated, vertically sided ; 

 phyllodes single pored, broad, with many pores arranged in three 

 series in each half -ambulacrum. 



Occurrence. — Living in the West Indies. 



Location of type specimen. — Museum of Comparative Zoology, 

 Harvard. 



Family FAUJASIDAE Lambert, 1905a 



Small to large, often broad, circular to elongate, flat adoral sur- 

 face; apical system anterior, tetrabasal, or monobasal, four genital 

 pores ; periproct supramarginal to inframarginal, often with anal 

 groove ; peristome central to anterior ; petals equal, broad, closed 

 (except in Australanthus) , outer pore slitlike, pores strongly con- 

 jugate, single pore in all ambulacral plates beyond petals; bourrelets 

 strongly developed ; phyllodes usually greatly widened, single pored, 

 with few to many pores, buccal pores present; tubercles larger 

 adorally, naked granular zone in interambulacrum 5. 



Genera. — Petalobrissus, Stigmatopygus, Pygidiolampas, Gongro- 

 cJtanus, Pygurostoma, Lefortia, Faujasia, Eurypetahan, Domechinus, 

 Fauraster, Hardouinia, Australanthus. 



Range. — Upper Cretaceous (Cenomanian) to Eocene. 



