NO. 3 CASSIDULOID ECHINOIDS — KIER ^J 



N. angiistatus has single-pored phyllodes and buccal pores, and 

 therefore should not be referred to Phyllobrissus. 



Range and distribution. — Upper Jurassic to Upper Cretaceous 

 (Kimmeridgian to Senonian) of Europe, India, and United States. 



DESCRIPTION OF TYPE SPECIES 



PHYLLOBRISSUS GRESSLYI (L. Agassiz) 



Plate II, figures 4, 5; text figures 60, 61 



Catopygus gresslyi L. Agassiz, 1839, Ech. foss. Suisse, pt. i, p. 49, pi. 8, figs. 1-3. 



Material. — Three specimens studied in the Lambert Collection, 

 Sorbonne, one in the d'Orbigny Collection in the Museum National 

 d'Histoire Naturelle, Paris, and one in the collections at the U. S. 

 National Museum. 



Shape. — Small, elongate, slightly angular marginal outline, greatest 

 width and height posterior to center, posterior margin slightly trun- 

 cated obliquely with surface visible adapically, adoral surface flat to 

 slightly depressed. 



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

 fig. 60), posterior genital plates in contact. 



Ambulacra. — Petals narrow, equal length, open, with only slight 

 tendency to close; petals II, III, and IV extending almost to margin, 

 petals V and I over one-half distance to margin ; interporiferous zones 

 twice width of poriferous zones; pores slightly conjugate, outer pore 

 elongated obliquely to round inner pore. 



Periproct. — Supramarginal, but near margin, longitudinal, with 

 groove extending from opening to ventral edge of test. 



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

 depressed. 



Floscelle. — Bourrelets slightly developed ; phyllodes double pored 

 (text fig. 61), with two series of pore pairs in each half -ambulacrum : 

 seven to nine pore pairs in each outer series, four to six in inner 

 series; inner or lower pore of each pore pair much smaller than 

 other pore. 



Occurrence. — Neocomian of France and Switzerland. 



Location of type specimen. — Unknown. 



Synonym of PHYLLOBRISSUS 



Anthobrissus Pomel, 1883. Class, meth., p. 60. Type species by subsequent 

 designation, Mortensen (1948, p. 167), Nucleoliics cercelcti Desor in Agassiz 

 and Desor (1847, p. 155). 



