CORNIFEROUS LIMESTONE. 
173 
1. Pterinea? cardiiformis , n. s. — General figure cordiform ; valves equal; posterior 
margin alate ; cast of wing gibbous ; surface marked by fine radiating striae, and crossed by 
prominent lines of growth; beaks large and prominent. Wing imperfect in the specimen 
figured. 
The shell is perfectly preserved upon the specimen figured, which is from the cabinet of 
Mrs. Ransem of Clarence Hollow. Several perfect casts were found in the same vicinity. It 
closely resembles a species of this genus in the Oriskany sandstone. It is with some hesita¬ 
tion that I refer this fossil to the genus Pterinea , being inclined to consider it distinct. 
Localities —Clarence Hollow, and one mile west of this place. 
2. Tentaculites scalaris, Schlotii. ( Silurian Researches, p.643, pi. 19, f. 16.) — Sub¬ 
ulate ; composed of a series of truncated cones, with their bases towards the apex of the shell. 
Each higher joint appears to proceed from within the one below, “forming a set of steps 
rather than rings, like the sliding joints of an opera glass.” 
In England this fossil is abundant in the Caradoc sandstone, as it is in New-York in the 
Hudson river group ; and Mr. Murchison remarks, that “ it is not possible to distinguish this 
body from the Tentaculites of the Ludlow formation.” The one figured holds a place more 
nearly equivalent to the latter formation. 
Locality —Le Roy, Genesee county. 
3. Orthony chia* — Tapering, slightly curved above; obtusely angular, having the form of 
a claw or talon, as the generic name indicates. 
There are several forms similar to this in the limestones of the Helderberg division. 
Locality —Near Williamsville, Erie county. 
4. Euomphalus? rotundus, n. s.— General form spheroidal; last whorl very much ex¬ 
panded ; rapidly tapering to the summit, which is moderately elevated ; umbilicus large. 
The figure is from a cast. Shell striated. 
Locality —Clarence, Erie county. 
5. Calymene crassimarginata, n. s. — The abdomen and caudal portion of this fossil is of 
frequent occurrence in this rock. There are about sixteen articulations visible in the middle 
lobe, and two or three more on the lateral ones. It is distinguished by its great convexity, 
the prominence of the middle lobe, and the thick margin. The middle lobe is rather flat, and 
the articulations extend nearly straight across, bending more suddenly down at the sides. The 
articulations toward the extremity are often scarcely visible in the cast. 
This fossil is one of those forms typical of this rock throughout Ohio, Indiana and Kentucky. 
Localities —Near Williamsville, Clarence, Caledonia and Avon. 
* A new genus, which I have adopted on the suggestion of my friend Mr. S. S. Haldeman, and which will include 
several forms analogous to this. See forthcoming Palaeontology for description. 
