228 A. Winchell on Fossils from the Potsdam 
Ortnts BaRraBuEnsis, n. sp. 
There are several imperfect specimens of an Orthis, apparently 
of the type of 0. biforatus. The form is transverse, with a 
straight hinge-line,“ and the sub-equal beaks a little elevated 
D. Owen (Rep. Wis. Jo. and Min., p. 575) and Shumard 
(St. Louis Trans., i, 627) have made allusion to the existence of 
STRAPAROLLUS (OputLeta) PRIMORDIALIS, nD. sp. 
A planorboid shell, three-fourths of an inch in diameter, and 
having the apex of the spire depressed below the level of the 
outer whorl. The number of whorls is probably about five, 
but only the last two are preserved in the best specimens. + 
tube enlarges very gradual] y, and is marked by a distinct carina 
just above the peripheral line, above and below which is a shal- 
oov: 
Some of the specimens of this fossi] greatly resemble the if 
rock of New York; but the volutions enlarge a little ee 
PLevrotomaria? apvena, n. sp. 
A trochoid or sub-turreted shell, of at least four whorls, 
which are depressed-convex externally, and apparently destitute 
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