MADE BY DR. ANTONIO RAIMONDI IN PERU. 301 



Two others, agreeing with it in character occur, but both are so imperfect on the 

 surface that I have not ventured to describe them. The first is from the elevated 

 table-land, two leagues from Cajamarca; the other from the town of Pion, Prov. 

 of the Amazons. They are certainly Cretaceous. 



ENNALASTER, d'Orb. 

 E. Peruanus, n. s., PI. 43, fig. 4, 4a, 4b, 4c. 



Shell rounded subpentagonal ; anterior end rounded, emarginate ; posterior 

 truncate; sides most prominent in advance of the middle; top convex, highest 

 posteriorly; mouth small, rounded; anus rounded-triangular, with the apex below. 

 Upper surface with tubercles sparsely scattered, some smaller ones bordering the 

 anterior groove; below, a triangular space between the mouth and posterior end is 

 closely studded with tubercles, while the remainder of the surface carries but few. 



Figures. Natural size. 



Locality. From the Cretaceous table, two leagues from Cajamarca, and near 

 Ollon. 



Remarks. Closely allied to E. Texanus, Eoem. sp. {Toxaster), but is less mark- 

 edly pentagonal, more narrowed behind, and differs in the shape of both the 

 apertures. 



PERIASTER, d'Orb. 

 P. ATTSTEALis, n. s., PI. 43, fig. 5, a, b, c. 



Shell ovate-pentagonal, narrowed and truncated behind ; rounded and emar- 

 ginate in front ; ambulacra deeply impressed, the posterior pair very much shorter 

 than the others ; the inter-ambulacral spaces angulated in the middle near their 

 apices ; upper sui'face high posteriorly, sloping downwards in advance ; mouth 

 subreniform, transverse; anus elliptical, greatest diameter vertical. Surface closely 

 covered with small tubercles; on the under side is a triangular space with its apex 

 towards the mouth, bordered by a broad naked strip. 



Figures. Natural size. 



Localities. From the hills of the District of Huancaspata, Prov. of Pataz, and 

 from the Hacienda of Uchupata, Prov. of Huari ; also, the Hacienda of Macanga, 

 the neighborhood of the town of Huallanca, Prov. of Huamalies and near the 

 town of Bagua, Dept. of Chachapoyas. Cretaceous. 



Remarks. This species differs from the Texan Cretaceous P. Texanus, Roem. 

 sp. (Hemiaster) in having a less pentagonal outline, being broader and much 

 higher posteriorly, with the apex placed further back, and in having the anal 

 groove less pronounced. It also differs somewhat in the shape and position of 

 both apertures. 



66 



