NO, 3 CASSIEUJLOID ECHINOIDS KIER 73 



Ambulacra. — Petals broad, flush, extending over two-thirds dis- 

 tance to margin; open or with shght tendency to close. Interporifer- 

 ous zones twice width poriferous zones; poriferous zones narrow, 

 tapering distally; pores conjugate, outer pore elongated transversely, 

 inner round. 



Adoral interamhulacra. — Plate arrangement of interambulacrum 5 

 similar to other areas (text fig. 57), single plate at peristome, pre- 

 ceded by alternating plates. 



Periproct. — High on margin, surrounding area slightly inflated, 

 opening longitudinal, not visible dorsally. 



Peristome. — Anterior, pentagonal, higher than wide, flush with test. 



rioscelle. — Bourrelets well developed, inflated with steep vertical 

 sides, phyllodes broadened (text fig. 55), double pored, outer pore 

 more than twice size of inner pore; 10 to 11 pore pairs in each outer 

 series, 4 to 5 in each inner series ; no buccal pores. 



Tuberculation. — Adoral tubercles same size as adapical. 



Occurrence. — Cenomanian of France and Germany. 



Location of type specimen. — Not known. 



Synonym of CATOPYGUS 



Penesticta Pomel, 1883. Class, meth., p. 64. Type species by monotypy, 

 Oolopygns bargesii d'Orbigny, 1856. 



DESCRIPTIOX OF TYPE SPECIES 

 CATOPYGUS BARGESII (d'Orbigny) 

 Plate II, figures 1-3; text figures 58, 59 

 Oolopygus bargesii d'Orbigny, 1856. Pal. franc, Cretace, vol. 6, atlas, pi. 976. 



Material. — Two specimens were seen in the d'Orbigny Collection, 

 Museum National d'Histoire Naturelle, Paris; two in the Lambert 

 Collection at the Sorbonne, Paris, and three in the De Loriol Collec- 

 tion in the Museum d'Histoire, Naturelle, Geneve, Switzerland. All 

 these specimens were topotypic. None of the specimens are well 

 preserved, being badly weathered or partially covered with matrix. 



Shape. — Small, approximately 25 mm. long, elongate with greatest 

 width posterior to center, highly inflated with greatest height posterior 

 to center, steep sides; adoral surface flattened. 



Apical system. — Anterior, tetrabasal, three genital pores, no pore 

 in genital 2 (text fig. 58) ; posterior genital plates in contact with 

 each other. 



Ambulacra. — Petals slightly developed, pores in petals small, only 



