FOSSILS OF THE CARBONIFEROUS. on 
od 
Schizodus curtiforme, n. sp. 
Plate xxii, figs. 3, 3a. 
Shell small, subrhomboidal, moderately convex; posterior dorsal region 
back of the umbonal ridge compressed and cuneate; umbonal slope dis- 
tinctly angular from the beak to the postero-basal margin; anterior slope 
rather abrupt to the anterior margin. Beak elevated, incurved, and situated 
a little anterior to the center. 
Surface of the cast with a few indications of concentric lines of growth. 
Interior characters unknown. 
Dimensions: height, 1.5°™; width, 1.75°; convexity or depth of right 
valve, .5°™. 
This little species is related to Schizodus curtus M. and W. (Geol. Sury. 
Ill, vol. v, p. 582), and 8. Rossicus De Vern. (Russ. and Ural Mts., p. 309), but 
can scarcely be referred to either specifically. 
Formation and locality—Lower portion of Lower Carboniferous lime- 
stone in canon directly south of a small conical hill on east side of Secret- 
canon-road Canon, Eureka District, Nevada. 
Schizodus Pintcensis, n. sp. 
Plate xxii, figs. 2, 2a. 
Shell about the average size of species of the genus; outline obliquely 
subrhomboidal; base strongly arcuate; umbonal slope distinctly angular, 
with the posterior side flattened; general surface moderately convex, cury- 
ing evenly over the central portions anterior to the umbonal angle and then 
more abruptly down to the anterior margin. Beaks elevated, incurved, and 
placed on the anterior third of the shell. 
Surface of cast showing a few lines of growth. 
Dimensions: height, 2; width, 2.25°"; convexity or depth of left 
valve, 0.5°™. 
Some of the examples are more oblique, and have the appearance of 
being more erect, owing to the greater curvature of the basal margin. This 
is shown in the illustration of the right valve. 
