52 
AUG. F. ■ FOERSTE 
than with the more triangularly cuneate specimens represented 
by figures 2a, 2b, and 2c on the same plate. 
2. Dalmanella eugeniensis Williams 
Plate XIII, fig, 7 
Dalmanella eugeniensis Williams, Geol. Surv. Canada, 
Memoir 111, 1919, p. 118, pi. VII, figs. 1-8. 
Specimen a brachial valve, 7.5 mm. long, and 9 mm. wide; 
most strongly convex about 1.5 mm. from the beak, with a 
narrow median depression posteriorly, widening to a broad 
depression along the anterior half of the valve. About 8 radiat- 
ing striae reach the anterior margin of the valve in a width of 3 
mm., the total number on the valve being between 40 and 45. 
3. Schuchertelia creditensis Sp. nov. 
Plate XIII, fig. 6 
Cf. Leptaena subplana Hall, Pal. New York, 2, 1852, p. 259, 
pi. 53, figs. 8a, 8b. 
Pedicel valve 15.5 mm. long, 18.5 mm. wide, with a convexity 
of almost 2 mm. at a point 5 mm. anterior to the beak. The 
valve is gently convex, without any trace of reversal of curva- 
ture anteriorly. At the posterior margin of the valve the lateral 
sides curve gently inward. Along the anterior margin, 7 to 8 
radiating striae occur in a width of 3 mm., the alternate striae 
being distinctly more prominent. Along the postero-lateral 
margins this alternation of size is even more evident. The 
dental lamellae are nearly 3.5 mm. in length and diverge from 
each other at an angle of about 80 degrees. 
The largest specimen found was 21 mm. in width. 
Several small brachial valves, regarded as belonging to the 
same species, are much less convex than the pedicel valve here 
described. 
