NO. 3 CASSIDULOID ECHINOIDS — KIER 5I 



DESCRIPTION OF TYPE SPECIES 



PYGURUS (PYGUROPSIS) NOETLINGI De Loiiol 



Plate 4, figures 1-4; chart 3, figure j 



Fygiirus noetlingi De Loriol, 1899. Mem. Soc. Phys. Hist. Nat. Geneve, vol. 33, 

 pt. 2, No. I, p. 4, pi. I, fig. 3. 



Material. — Holotype, and only known specimen. 



Shape. — Small, length slightly greater than width, posterior margin 

 slightly pointed, anterior margin blunted with slight anterior groove ; 

 adapical surface inflated, margin very thick with steep sides, greatest 

 height anterior at apical system ; adoral surface depressed at peri- 

 stome, interambulacra inflated. 



Apical system. — Anterior, four genital pores, tetrabasal. 



Ambulacra. — Petals very broad, closing distally, equal, petals II, 

 III, and IV extending almost to margin ; petals I and V over two- 

 thirds distance to margin. Interporiferous and poriferous zones very 

 wide, tapering distally ; pores in each zone widely separated for most 

 of length of zone ; pores conjugate, outer pore slitlike, inner pore 

 elongated transversely. 



Periproct. — Marginal to slightly inframarginal, oval. 



Peristome. — Anterior, pentagonal, slightly higher than wide. 



Floscelle. — Bourrelets well developed, inflated; phyllodes well de- 

 veloped, greatly broadened, double pored with three series of pore 

 pairs in each half-ambulacrum: lo to 12 in the outer series, 3 in the 

 middle, and 2 to 3 in the inner (chart 3, fig. j) ; interporiferous area 

 very broad; two adjacent pore pairs near peristome, separated from 

 rest of pores, presumably buccal pores. 



Occurrence. — Cretaceous (Cenomanian), Keft-Akab, Ouadi Sanin, 

 Lebanon. 



Location of type specimen. — Holotype in De Loriol Collection, 

 Museum d'Histoire Naturelle, Geneve, Switzerland. 



Remarks. — Lambert (1899, p. 119) suggested from a study of 

 De Loriol's figures that ambulacrum III was different from the 

 others. Ambulacrum III is petaloid like the other petals, but on the 

 holotype the anterior surface is worn, partially obscuring this petal. 



The presence of paired buccal pores in this species is most unusual. 

 As discussed on page 7, buccal pores are found in all species having 

 smgle-pored phyllodes but rarely in species with double-pored phyl- 

 lodes. 



