Description of New Fossils from Ohio and Kentucky. 719 
It has been confounded with the C. vallandinghami, S. A. Miller, 
from which it is entirely distinct. The body chamber being wanting 
in all the specimens, the diameter can not be determined. I regard 
the specimen, fig. 6, Pl. IL, as a different species, and nearly allied to 
C. vallandinghami, S. A. Miller. 
CYRTOCERAS IRREGULARE, nov. sp. (Plate II., fig. 3). 
Shell composed of short segments, nearly equal in length and size in 
the anterior third, gradually becoming shorter and smaller in the pos- 
terior two thirds. It is moderately curved, the curvature not being 
well shown in the figure, which is a dorsal view. The specimen is 
slightly distorted by pressure, but evidences remain that it was some. 
what elliptical in section from the shortening of the dorso-ventral di- 
ameter. , 
The irregularities of form, which are well shown in the figure, char- 
acterized, likewise, a specimen once shown to me at the University, by 
the veteran paleontologist, C. B. Dyer, Esq., and which I instantly 
recognized as being this species. These two specimens are the only 
ones that have fallen under my observation. ‘The siphuncle is dorsal 
and comparatively large. 
The specimen figured, which has a small portion of the body cham- 
ber, consists of twenty-four septa, and measures 55 mm, in length. 
The body chamber measures 24 mm. in its greatest, and J1. mm. in its 
least diameter. The opposite extremity measures 8 mm. and 5mm. in 
the same diameters, respectively. I collected this species in May, 1877, 
at Freeport, Warren county, Ohio, in the upper part of the Cincinnati 
Group. It appears to be rare. 
Genus Trematopiscus, Meek and Worthen, 1861, Proc. Acad. Nat. 
Sci., Phil. . 
TREMATODISCUS KONINCKI, nov. sp. (Plate IL, fig. 4.) 
‘Shell consisting of about three coils, formed of about sixty septa, 
and a partof the body-chamber, measuring 38 mm. in length, on the 
outer convexity. 
The septa, as may be seen in the figure, are joined by slightly waved 
sutures, which have, also, a small dorsal flexure. They are longer on 
the dorsal than on the ventral side, presenting a somewhat wedge- 
shaped appearance as shown by the figure. The five septa immediately 
following the body-chamber are 6 mm. in length on the dorsal surface. 
