SYSTEMATIC DESCRIPTIONS SPATANGINA. 79 



tinguished from its near allies by its shallow and broad anterior furrow, 

 which does not reach to the ambitus, by the shallow depressions of the 

 paired ambulacral petals, by the far posterior position of the apical disk, 

 and by its strongly rounded form. The periproct is very rounded on the 

 upper part of the posterior face and is not visible from above. 



Eocene, St. Bartholomew limestone, St. Bartholomew, Guppy collec- 

 tion ex Cleve, 4 specimens, cotypes, U. S. Nat. Mus. No. 115416. Cot- 

 teau also mentions having specimens from the museums of Stockholm 

 and Upsala. From a conglomerate and shaly bed interbedded with 

 limestone below the main limestones and at the top of the conglomerate 

 series of beds, point between Colombier Point and bay next to St. Jean 

 Bay, St. Bartholomew, T. W. Vaughan collector, 1914, 1 specimen, 

 U. S. Geol. Sur. station 68976. 



Paraster species a. 



The following is a description of the specimens: 



Test of medium size, high, rounded, expanded anteriorly, and bluntly 

 truncate; narrowed posteriorly. Upper face high, obliquely inclined from 

 the highest point posteriorly. Border high, rounded, lower face rounded. 

 Apical disk subcentral, a little posterior. Anterior furrow moderately 

 deep, subcarinate on the sides dorsally, extended to the peristome. Anterior 

 ambulacrum straight and narrow. The paired ambulacra are deeply 

 excavated, very unequal. The anterior pair II and IV widely divergent, 

 the posterior pair I and V much shorter, rounded at the tips. Peristome 

 anterior, transverse. Periproct and fascicles not visible. 



There are only 2 specimens, the larger being the better preserved. It 

 measures 26 mm. in height, 33 mm. in length, and 29 mm. in width. The 

 specific identity, and even the generic, are doubtful on account of the 

 lack of detailed structure, but it appears to be a Paraster and quite near 

 to P. subcylindricus. Associated with Cidaris foveata, sp. nov.,Echino- 

 lampas ovumserpentis, and Eupatagus sp. a, as here described. 



Eocene, from yellowish limestone, probably the Cambridge formation 

 of R. T. Hill, Jamaica, with no detailed locality; 2 specimens, Mus. 

 Comp. Zool. No. 3236. 



Paraster species b. 



A specimen of Paraster that is too incomplete to describe as new and 

 does not seem referable to any of the known species is of interest as being 

 from the island of Trinidad, so it is briefly described. 



Test moderately high, truncate anteriorly; pointed posteriorly; dorsally 

 with a deep anterior furrow that extends over the ambitus and to the 

 peristomal border. The ambulacra are completely obliterated, excepting 

 ventrally, where they are seen extending to the peristome. The apical 

 disk and periproct are also quite invisible. The peristome is situated far 

 anteriorly; it is wide, labiate, and sunken. The specimen measures about 

 16 mm. in height, 27 mm. in length, and 23 mm. in width. This specimen 

 makes a close approach to Paraster loveni in form, but that species comes 

 from the Oligocene and is probably distinct. 



