MADE BY DR. ANTONIO RAIMONDI IN PERU. 295 



Three specimens, one from "between Molinas and Paucara;" a second from 

 "a place named Taraino, two leagues below Iscuchaca ;" and the third "from the 

 hill of Santa Barbara, where there is a mine of mercury," all in the Dept. of 

 Huancavelica. To the last no geological age is assigned, but Dr. Raimondi refers 

 the first two doubtfully to the Jurassic. Bayle and Coquand referred the shell to 

 the Lias, while d'Orbigny in the Prodrome places it in the Neocomien, in which 

 opinion I followed him in my "Synopsis." Hupp6 also considers it Lias. 



N., sjo. indet. 



A rolled specimen of the deep valve of an undescribed species, characterized 

 by about 25 nearly uniform large ribs and no apparent intermediate sculpture. 

 It is nearest to N. Texana, Roem. (sp.), but that has but 15-17 ribs. It is from 

 the "town of Bagua, on the left bank of the river Utcubamba, Dept. of Chacha- 

 poyas."* The shell is too imperfect to describe, but is important as fixing the 

 Cretaceous age of the rocks from which it is derived. 



PLICATULA, Lam. 

 P. TORTA, n. s., PI. 42, fig. 5. 



Shell long, sub triangular, slightly oblique, inequi valve ; lower valve slightly 

 convex, upper valve flat ; right side nearly straight, left side and base broadly 

 rounded; surface marked by large, coarse squamose lines of growth, crossed by 

 small radiating ribs, which are interrupted by the concentric lines and present a 

 fimbriated appearance. 



Figure. Natural size. 



Locality. Quebrada of Colpamayo, near Chota, Dept. of Cajamarca. Cretaceous. 



ANOMIA, Linn. 

 A. Peruana, n. s., PI. 42, fig. 6. 



Shell variable in shape ; circular to irregularly elliptical ; beaks low, marked, 

 and submarginal; surface marked by irregular lines of growth and concentric 

 undulations. 



Measurements. Average diameter, about 0.8 in. One specimen, one inch long 

 by 0.75 wide. 



Locality. "Quebrada del Alfalfar, a quarter of a league south of Chachapoyas," 

 on the surface of a distorted cast of a large shell, apparently Cacullcea Orbignyana. 

 Cretaceous. 



Remarks. The surface of the cast is covered by a group of these little shells, 



* So says the label, while the catalogue accompanying places it in the "Department of the Amazons." 



