324 
Aug. F. Foerste 
The type of Orthodesma cuneiforme is an internal cast. Its 
length from the beaks to the posterior margin, along the umbonal 
ridge, is 80 mm.; its thickness from valve to valve is 3.6 mm. The 
distance along the hinge-line from the tips of the beak to the pos- 
terior end of the hinge-line is estimated at 30 mm.; anterior to the 
beak the hinge-line extends between 5 and 7 mm. With this hinge- 
line the umbonal ridge forms an angle of about 50 degrees. The type 
is defective along the basal margin and along the entire posterior 
margin, but enough is preserved to indicate the general outline. 
In a second specimen of Whitella cuneiforme, presented to me 
by Prof. W. H. Shideler, of Miami University, obtained somewhere 
in the lower part of the Richmond in Warren county, Ohio, the basal 
margin is well preserved, and more is preserved of the parts bordering 
on the posterior margin. This shell differs from the type only in 
having the umbonal ridge more inflated anteriorly, so that a mod- 
erately concave curvature exists between the anterior half of the 
umbonal ridge and the anterior half of the basal margin of the 
shell. 
The specimen figured by Miller and Faber as Sphenolium 
cuneiforme (Jour. Cincinnati Soc. Nat. Hist., 17, 1894, p. 141, pi. 
8, figs. 5, 6), from the same locality as the type of that species, was 
incorrectly identified. It forms No. 8792 in the Faber collection 
at Chicago University, is labelled as coming from Versailles, in 
Indiana, and evidently is a species of Modiolopsis. The specimen 
is badly crushed along the umbonal ridge posteriorly, and all of the 
upper part, posterior to the beak, is missing. The shell, originally, 
was only moderately convex, the mesial depression anterior to the 
umbonal ridge was weakly defined, there was no concave curvature 
along the base, and if Modiolopsis versaillesensis ever attained so 
large a size, these incorrectly identified specimens probably 
belonged to that species. 
32. Whitella richmondensis, Miller 
{Plate VII, Figs 2 A, B, C) 
1889. Sphenolium richmondense Miller, N. A. GeoL Pal., p. 513, Figs. 925, 926 
The type of Sphenolium richmondense is numbered 8800 in 
the Faber collection at Chicago University. It is labelled as coming 
