CCELOSPIRA OF THE CORNIFEROUS LIMESTONE. 
32e> 
Coelospira concava, 
PLATE LIII. 
Leptoca.Ua concava Hall, Pal. New-York, Yol. iii, pa. 245, pi. xxxviii, figs. 1-7. 1861. 
Calospira concava : Hall, Sixteenth Report on the State Cabinet, p. 60, with figure. 1863. 
The specimens from the Upper Helderberg limestone at Caledonia, 
New-York, and those from the upper portion of the Lower Helderberg 
group, in Oneida and Herkimer counties, do not show any differences of 
specific importance, and I am therefore constrained to regard this species 
as passing upwards from the Lower Helderberg formation; unless indeed 
we may infer that some of the sediments of that epoch may have exten¬ 
ded farther to the westward and this species have there existed, while 
the superincumbent formations of limestone, in the absence of the Oris- 
kany sandstone, have directly succeeded the older beds in such a manner 
as to have become incorporated with them, or to have left no line of 
demarcation. 
A single specimen from Stafford in Genesee county is considerably 
larger than any of those from other localities of the Corniferous lime¬ 
stone or of the Lower Helderberg group, while the sinus of the dorsal 
valve is narrower and less depressed. The material at present possessed 
is insufficient to characterize it as a distinct species. 
Geological formation and localities. In the Corniferous limestone at Caledonia 
and other places in Western New-York, and also in the same formation in Canada 
West. 
[ Paleontology IV.] 
42 
