122 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I44 



(Gauthier), another post-Cenomanian species that Lambert and 

 Thiery refer to Clypeopygus, is certainly a Petalobrissus. I have 

 studied the holotype in the Lambert Collection at the Sorbonne and 

 include photographs (pi. 16, figs. 1-3) of the specimen and a drawing 

 (text fig. 102) of one of its phyllodes. Its petals are very similar to 

 P. setifensis and it has single-pored phyllodes with buccal pores. It 

 is probable that none of the post-Cenomanian species that Lambert 

 and Thiery refer to Clypeopygus belong to that genus. 



Lambert's (1931, p. 31) Procassidulus ncltneri from the Ceno- 

 manian of North Africa is also a Petalobrissus. I studied the holo- 

 type in the Lambert Collection at the Sorbonne, and include new 

 photographs (pi. 17, figs. 1-3) of it and a drawing of one of its 

 phyllodes (text fig. 105). Its petals and floscelle are very similar to 

 Petalobrissus setifensis, and its supramarginal periproct is similar 

 in location to the periproct in Petalobrissus djelfensis (Gauthier). It 

 is easily distinguished from Procassidulus (herein considered a syno- 

 nym of Rhynchopygus) by its larger test and much more developed 

 petals and phyllodes. 



I have examined many of the Texan specimens referred by Cooke 

 (i953> P- 17) to Phyllobrissus cubensis (Weisbord), and if these 

 specimens are conspecific with Weisbord's holotype, this species 

 should be referred to Petalobrissus. The phyllodes are single pored 

 (text fig. 106), not double pored as in Phyllobrissus, the pores in 

 the petals are more conjugate, the periproct is more supramarginal, 

 and buccal pores are present. I include a drawing (text fig. 107) of 

 the adoral plate arrangement. 



Lambert's (1936, p. 5) Petalobrissus burckhardfi from the Se- 

 nonian of Mexico looks more like a Rhynchopygus. Its small, elon- 

 gate, flattened test with flush, slightly developed petals and weak 

 phyllodes is typical of Rhynchopygus not Petalobrissus. 



Fourtau's Echinobrissus ammonis and E. lefebvrei have single- 

 pored phyllodes and should not be referred either to Echinobrissus 

 (a junior objective synonym of Nucleolitcs) as done by Fourtau 

 or to Clitopygus (= Nucleolitcs) as done by Lambert and Thiery 

 (1921, p. 346). They are herein referred to Petalobrissus. I was 

 able to study the type specimens of these two species, and since 

 Fourtau did not describe many of the important details of them, I 

 have included a redescription and new photographs and drawings 

 below. 



Range and distribution. — Cretaceous (Cenomanian to Senonian) 

 of North Africa and America. 



