234 PALEONTOLOGY OF THE EUREKA DISTRICT. 
Genus PTERINEA Goldfuss. 
Pterinea Pint6ensis, n. sp. 
Plate xix, fig. 10. 
Shell very small; body part obliquely elongate, narrowing towards 
the beak, which extends a little above the hinge-line. ‘The anterior ear is 
small, rounded in front, and somewhat compressed; posterior ear large, 
compressed, extending beyond the posterior extremity of the valve, pointed 
at the end, and slightly sinuous behind. The body of the valve ranges at 
an angle of about 40° with the cardinal margin. 
Surface marked by strong concentric striz. 
This little shell has a length of 10™™ on the cardinal line and a height 
at right angles to this of 6™™. It is unlike any species known to me occur- 
ing at this horizon. 
The generic reference to Pterinea is made in the absence of any 
knowledge of the interior characters. It is very probable that it belongs 
to the genus Actinopera, but with the material at hand this cannot be deter- 
mined. 
Formation and locality—Lower portion of the Carboniferous Group, on 
northeast side of cation north of Pinto Peak, Eureka District, Nevada. 
Genus LEPTODESMA Hall. 
Leptodesma, sp. ? 
Two species of this genus are represented in the collections from the 
lower portion of the Carboniferous. One is quite strongly marked, and is 
allied to Leptodesma Rogersi Hall, of the Hamilton Group of New York, 
and the other to L. complanatum Hall, from the Chemung Group, New York 
(See Pal. N. Y., vol. v, pt. 1, pp. 176, 227). Each is represented by a single, 
not very well-preserved specimen, which renders a specific identification 
very uncertain and unsatisfactory. 
