1888. | NEW YORK ACADEMY OF SCIENCES. 179 
tively large flattened, ancipital, divergently striated central cone, 
with two lateral denticles set on a comparatively narrow base; 
the mandibles are partially ossified, and retain their form; the 
eyes are large, and were inclosed in bony capsules; the skin of 
the under side of the body is transversely wrinkled and fibrous, 
above granulous; the pectoral fins are perfectly preserved, show- 
ing both rays and web; in the largest individual found, which 
must have been 6 feet in length, they are 7 inches long by 
5 inches wide at the base, conical in outline, slightly falcate, 
-and show about 20 rays, which are without articulations, simple 
toward the base, and forked at the summit; the dorsal and 
caudal fins are not well shown in any specimen of this fish yet 
obtained. 
2. Actinophorus, nov. gen. ‘Tiled-scaled ganoids of medium 
size, long and slender ; body cylindrical ; head pointed, bony ; 
teeth numerous, conical, acute; fins without fulcra, delicate, 
many-rayed ; scales narrow quadrangular, thin. 
Actinophorus Clarkii, n. sp. Fish slender, about 2 feet in 
length by 24 inches in diameter at the pectoral fins ; head coni- 
cal, pointed, well ossified, 7 to 8 inches long; branchiostegals 
numerous; pectoral fins broadly conical, somewhat falcate, 3 
inches long by 14 inches wide, containing about 60 fine parallel 
ossified rays; anal fin 18 inches from muzzle, relatively small, 
triangular in outline ; caudal fin strongly heterocercal. 
The affinities of this fish are apparently with Acrolepis, but it 
differs from the fishes of that genus by the absence of fulcra 
from the fins, and the thinner and more quadrangular scales. 
3. Dinichthys curtus. Fishes of medium size; cranium tri- 
angular, from 12 to 15 inches in length ; defensive plates of the 
under side of the body relatively short and thick ; posterior 
lateral plates nearly square, slightly rhomboidal, 4 inches in 
diameter ; posterior process 3 inches long; anterior lateral 
plates 8 inches long by 5 inches wide. This species also occurs 
in the Chemung of Pennsylvania. 
4, Dinichthys Terrelli (?), Newb. With the fish remains 
mentioned above are portions of the body plates of species of 
Dinichthys which, with the material in hand, is undistinguish- 
able from that so common in the overlying Cleveland shale. 
5. Dinichthys tuberculatus, n. sp. Head unknown, body 
plates of smallarea, but very thick, and having exposed portions 
covered with large, stellate tubercles; supra-scapular plates 
about 3 inches in breadth and 3 an inch in thickness; ex- 
ternal surface where not covered by the dorso-median or clavicle, 
tuberculated, and marked by the incised line running from the 
condyle to the posterior border, characteristic of the genus ; 
