288 
Aug. F. Foerste 
cardinal the outline at the beak. Anterior margin of shell fully 
12 mm. in front of the beak. Convexity, nearly 4 mm. 
23. Orthodesma pulaskiensis, sp. nov. 
{Plate III, Fig. 6) 
Basal and cardinal margins subparallel. In a shell having a 
length of 49 mm. the height at the beak is 13.5, and posteriorly 
it increases to 15.5 mm. The anterior extremity extends about 
10 mm. beyond the beak, and is incurved below the level of the 
cardinal outline. In the type specimen, a rather angular um- 
bonal ridge extends from the beak obliquely backward, becoming 
considerably less distinct along the posterior fifth of the shell. 
This angular umbonal ridge is the most characteristic feature of 
the type specimen but may not be equally well developed in other 
specimens belonging to this species. Below this umbonal ridge, 
and anteriorl^q the shell is marked by distinct concentric striae. 
Above this ridge, on the post-umbonal slope, the concentric striae 
are far less distinct. The anterior muscular scar is fairly large, 
and distinctly outlined, but not deeply impressed. From its 
lower posterior margin, a series of short vertical lines extends 
obliquely backward, and has some connection with the pallial 
line. The cardinal margin slopes gradually downward, rounding 
into the posterior margin, which is most strongly rounded along 
the lower third of its outline. 
Locality. Immediately below the railroad bridge, 1 mile east 
of Pulaski, New York (plate III. Fig. 6). 
The relationship of this form to the Modiolopsis anodontoides 
of Hall (Pal. N.Y. vol. I, pi. 82, Fig. 3a) remains to be deter- 
mined, but the latter appears to be shorter, with a straighter 
umbonal ridge, which is more divergent from the cardinal line 
near the beak. According to a label by Hall, Fig. 3b, pi. 82, 
the original of Cypricardites sinuata, Emmons, “proves to be the 
young of Cimitaria recurva, Hamilton Group.” 
A form with somewhat similar outline, but with the beak 
nearer the anterior margin, was found at a considerably higher 
horizon, in the fossiliferous sandstones, at the cross-roads, one 
mile south of Barnes Corners (plate III, Fig. 10). The umbonal 
ridge is not angular, and is distinct only near the beak. In con- 
sequence the slopes below the umbonal ridge, toward the basal 
