‘ 
g 
4A 
- 
ie New Species of Fossils from the Hudson River Group. BEY 
The specimen described, was found near Cincinnati, where it had 
evidently been drifted, and is supposed to be from the upper part of 
the Hudson River Group, possibly from Hamilton or Warren county. 
It now belongs to the author’s collection. 
INTERNAL STRUCTURE OF LICHENOCRINUS. 
Plate VIII., fig. 2, erect, internal lamelle of Lichenocrinus, natural size ; fig. 2a, 
magnified view. 
In 1874, the writer described the internal structure of Lichenocrinus 
tuberculatus, as follows: “Interior filled with upright lamelliform 
plates, radiating from a central point, on which the exterior plates ap- 
pear to repose’ (Cin. Quar. Jour. Sci., vol. i., p. 346). No single 
specimen suitable for illustrating this fact was then known. Recently, I 
received from Dr. D. T. D. Dyche, of Lebanon, O., a specimen preserving 
the upright lamellse, and having all the exterior plates removed. The 
lamelle bifurcate so that the intervening spaces do not exceed the 
thickness of the lamelle at-.the circumference. The bifurcations do 
not take place opposite each other in adjoining lamelle, but at different 
distances from the center, so that uniformity is preserved in the width 
of the inter lamellar spaces. The divisions take place within the cen- 
tral depression for the columnar attachment, on the convex circular 
elevation, and near the circumference. 
Dr. Dyche’s specimen is from the upper part of the Hudson River 
Group, within the range of ZL. tuberculatus, and therefore, probably, 
belongs to that species, though it might, of course, belong toa distinct 
species as this structure is characteristic of the genus. 
CUNEAMYA ELLIPTICA, Nh. Sp. 
Plate VIII., fig. 3, view of the left side of a cast, natural size; fiz. 3a, view of the right side 
of a smaller cast. 
Shell very inequilateral, subelliptical, about one half longer than 
high, greatest height posterior to the beaks, ventricose, and broadly in- 
flated in the umbonal region; anterior end projecting and rounding 
from the lunule to the base, which forms nearly a semi-elliptical curve; 
hinge line, slightly arching; posterior end somewhat truncated in the 
upper part, and narrowly rounded in the posterior basal region: beaks, 
prominent, incurved; posterior umbonal region very prominent, and 
rounded to the posterior third of the shell, and then sloping to the 
posterior basal region; anterior umbonal region forming a convex 
elevation extending from the beak to the base, and directed a little 
backward. <A shallow depression, commencing near.the beak and 
