178 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I44 



adorally, tubercles much larger, with polygonal scrobicules, with bosses 

 eccentric anteriorly, naked, pitted area in median of interambulacrum 

 5, ambulacrum III, and edge of adjacent interambulacra. 



Occurrence. — Recent of West Indies. 



Habitat. — Mortensen ( 1948, p. 209) suggests that the species lives 

 buried in coarse sand. 



Location of type specimen. — Unknown ; not found by this author 

 in the Lamarck Collection at the Museum d'Histoire Naturelle, 

 Geneve, Switzerland. 



Synonym of CASSIDULUS 



Glossaster Lambert, 1918. Mem. Soc. Acad. Aube, ser. 3, vol. 55, p. 39. Type 

 species by original designation, Cassidulus sorigneti Cotteau (1887, p. 512). 



Remarks. — Lambert established Glossaster as a subgenus of Pro- 

 cassidulus, differentiating it from the latter by its subtriangular peri- 

 stome. Unfortunately, I was unable to find any specimens of this 

 species in the Paris museums, but from Cotteau's figures it looks 

 like a typical Cassidulus having a small, low test, obliquely truncated 

 for the supramarginal periproct, flat adoral surface with well-devel- 

 oped bourrelets, naked medial zone adorally, and short petals. The 

 fact that the periproct is subtriangular does not seem of sufficient 

 importance to warrant subgeneric distinction, as the shape of the 

 periproct is quite variable within species of Cassidulus. 



Genus RHYNCHOLAMPAS A. Agassiz 



Rhyncholampas A. Agassiz, 1869. Bull. Mus. Comp. Zool., vol. i, p. 270. Type 

 species by subsequent designation, Lambert (1918, p. 41), Pygorhynchus 

 pacifictis A. Agassiz. 



Synonyms : Anisopetalus Arnold and Clark ; Galcrolampas Cotteau ; ? Gisopygus 

 Gauthier; Plagiopygus Lambert. 



GENERIC DESCRIPTION 



Medium to large, elongate, oval or with greatest width posterior 

 to center, moderately to highly inflated ; apical system anterior, mono- 

 basal ; petals lanceolate, equal, closing, with unequal poriferous 

 zones ; ambulacra single pored beyond petals ; periproct slightly supra- 

 marginal, marginal or slightly inframarginal, transverse; peristome 

 anterior, pentagonal, wider than high; bourrelets moderately devel- 

 oped; phyllodes single pored, widened, usually with tv/o series of 

 pores in each half -ambulacrum, approximately four pores in each 

 inner series; in some species three series of pores in each half- 



