70 TRIASSIC FISHES AND PLANTS. 
below to the tail; -head broad and obtuse, as wide as the body, about one- 
quarter the entire length; teeth conical, relatively large; dorsal line nearly 
straight, fins relatively small, dorsal and anal placed far back on body; 
dorsal midway between occiput and tip of tail and much behind middle of 
body; anal when depressed reaching nearly to base of caudal; ventrals 
nearer to anal than to pectorals; caudal narrow and weak; scales of medium 
size, apparently all smooth, those of the median edorsal line round or oval 
without spines. 
A large number of fishes of this species are contained in the collection 
presented to Yale College by J. H. Redfield. They are from the same 
locality, Chicopee Falls, Mass., and are nearly of the same size. They are 
contained in a rather coarse sandy shale, which has been considerably met- 
amorphosed by the proximity of trap-rock. This has obscured some of the 
details of structure, such as the surface of the scales, the shape and mark- 
ings of the head bones, ete., but has left the outlines of the body and the 
position and form of the fins distinctly visible. The most striking charac- 
ters of these fishes are the narrow, wedge-shaped form of the body, the 
straightness of the dorsal and ventral lines, the smallness of the fins, the 
posterior position of the dorsal, and the rounded and unarmed margins of 
the median dorsal scales. As mentioned above, these seem sufficient to 
warrant our placing them in a distinct genus, and since they are in most 
respects very similar to the group of fishes upon which Dr. Traquair has 
founded his genus Acentrophorus, it seems best to refer them at least pro- 
visionally to that. 
Order CROSSOPTERYGIDA Huxley. 
Family CCELACANTHINI Ag. 
Genus DIPLURUS Newb. 
Fishes of large size, fusiform in outline, having, in common with other 
members of the Ccelacanth family, a depressed and pointed muzzle, some- 
what angular occiput, two dorsal fins supported on interspinous bones, a 
dyphycereal caudal fin traversed by the spinal column which bears at its 
extremity a small supplemental caudal; the pectoral and ventral fins lobate, 
sin Ca 
