2i6 
A ug. F . Foerste 
ihis so-called Trenton. The chief interest of this species in the I 
present connection is its presence apparently in the lower part of 
the Cynthiana division of the Cincinnatian in some of the localities 
along the Ohio river. Named in honor of Ray S. Bassler. 
Dalmanella breviculus, nov. sp. | 
In the Middle Eden beds at Cincinnati, Ohio, flat finely striated i 
forms of Dalmanella occur, with 14 striations in a width of 5 mil- 1 
limeters in specimens 20 millimeters wide. The ratio of the l| 
length to the width often is as low as two-thirds. The result is I! 
a semicircular outline, readily distinguished from the subquadrate j| 
outline of Dalmanella emacerata-filosa, which also has fine stria- 'i 
tions. The pedicel valve is moderately convex, especially ante- i| 
riorly, the most convex part, one-third of the length of the shell j 
from the beak, rising 3 millimeters above the margin of the valve. ; 
There is a shallow median depression in the brachial valve. | 
Geological position. The types came from the Middle Eden i 
beds at Cincinnati, Ohio. It occurs at the same horizon at Vevay, | 
Indiana. Somewhat similar forms have been secured by Cin- i 
cinnati collectors about 60 feet above the base of the Eden. The | 
types from the Middle Eden beds, at Cincinnati, will be illustrated i 
later. In the meantime, fig. 2 on plate 2 of the Fifteenth Report, 
New York State Cabinet of Natural History, will serve as an excel- 
lent illustration of the species. It is not known, however, whe- 
ther this specimen is still in existence, or from what horizon it 
came. Hence it is considered inadvisable to use the specimen ! 
there figured as a type. i| 
i' 
Dalmanella fairmountensis, nov. sp. | 
{Plate IV, Figs. 2 A, B, C.) || 
Shell small, averaging 15 millimeters in width, but sometimes li 
attaining a width of 18 millimeters. Shell usually wider poste- | 
rior to the middle, the lateral edges more or less straightened, but l| 
converging anteriorly, suggesting a symmetrical trapezoidal rather ji 
than semicircular outline; however, shells with subquadrangular 1; 
and with semicircular outlines also exist. I 
Pedicel valve with sides somewhat flattened and sloping away 
from a more or less distinct median axis of elevation; the latter | 
