222 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I44 



Synonym of PSEUDOPYGAULUS 



Ottiliaster Penecke, 1885. Sitzungsb. Kais. Aked. Wiss., vol. go, p. 350. Type 

 species by monotypy, Ottiliaster pusillns Penecke. 



Remarks. — Lambert and Thiery (1921, p. 359), Collignon (1930, 

 P- 550) J and Mortensen (1948, p. 326) considered Ottiliaster a syno- 

 nym of Pseudopygaidus or Eolampas. I have not been able to locate 

 any specimens of the type species, but from Penecke's figures it 

 appears to be congeneric. 



Location of type specimen. — Unknown. 



Synonym of PSEUDOPYGAULUS 



Petalaster Cotteau, 1885. Bull. Soc. Zool. France, vol. 9, p. 330. Type species 

 by monotypy, Petalaster niaresi Cotteau. 



Remarks. — Cotteau (1887, p. 468-469) stated that when he erected 

 his genus Petalaster he did not know that Coquand had named a new 

 genus for Pseudopygaidus trigeri, a species that Cotteau considered 

 congeneric with his Petalaster maresi. He, therefore, placed his 

 Petalaster in synonymy under Pseudopygaulus. I have seen a speci- 

 men of P. maresi and agree that it is certainly congeneric with P. 

 trigeri. They are so similar that they appear to be almost conspecific. 

 Cotteau (1887, pi. 128, figs. 7, 8) shows double pores in the phyllodes 

 and in ambulacrum III of P. maresi. This same error occurs in all 

 his drawings of the other species of Pseudopygaidus. 



Location of type specimen. — I was unable to locate the type speci- 

 men but did find one specimen of this species in the Cotteau Collec- 

 tion in the ficole National Superieure des Mines in Paris. 



Family APATOPYGIDAE Kier 



Medium size, elongate, apical system tetrabasal in young, mono- 

 basal in adult ; petals moderately developed, ambulacral plates beyond 

 petals single pored ; periproct supramarginal ; bourrelets slightly de- 

 veloped, phyllodes single pored with two rows of pores in each 

 hal f -ambulacrum ; no buccal pores; "Pyrinid" plates in ambulacra 

 beyond petals. 



Genus. — Apatopygus. 



Range. — Upper Tertiary to Recent. 



Remarks. — The Apatopygidae are distinguished from all the other 

 cassiduloid families by their single-pored phyllodes lacking buccal 

 pores, and "Pyrinid" plating in the ambulacra beyond the petals. 



