38 TRIASSIC FISHES AND PLANTS. 
large, rays and fulcra strong; dorsal fin set at the middle of the entire 
length and midway between the occiput and base of caudal. 
These fishes resemble most those I have called Ischypterus lineatus, and 
they may prove to be only a well-marked variety of that species; but in 
this group the body is somewhat narrower, the head is larger, the fins are 
stronger and more conspicuous, and the dorsal is more posterior in position. 
Up to the present time fishes having the characters given above have 
only been found at Boonton, N. J. The types are in the geological museum 
of Columbia College. 
IscHYPTERUS MODESTUS, N. sp. 
Pl. IX, Figs. 1, 3. 
Fishes four to six inches in length by one and a half to two inches in 
width ; outline of body long-ovoid, symmetrically arched above and below 
anterior to dorsal and anal fins, rapidly contracted behind to half the ante- 
rior breadth ; fins broad, strong, and rounded; dorsal fin exactly in middle 
of entire length, opposite ventrals, fulcra strong, twelve in number, rays 
eleven; tail relatively broad, slightly emarginate lobes nearly equal, rays 
fifteen; anal rounded, not reaching base of caudal, fulera ten (?), rays 
seven; head relatively large, one-fourth the entire length, rounded, some- 
what obtuse; scales of dorsal line eighteen, of medium size, the one imme- 
diately anterior to the dorsal fin shield-shaped, not emarginate behind ; 
scales of sides relatively large and thick. 
The fishes which have been included in this species are small, and have 
the outlines of the body and fins rounded so as to give a smooth and gentle 
aspect; the curyes of the body are all graceful and flowing; the back and 
abdomen are uniformly arched to the dorsal and anal fins; behind these 
the outline contracts rapidly by coneave curves until the width at the base 
of the tail is less than half that of the anterior portion of the body. 
The fishes most nearly allied to these are those which I have included 
under the name J. elegans, and it is perhaps not certain they should be re- 
garded as distinct. The head is, however, more obtuse and rounded, the 
back less highly arched, and the fins apparently broader than in that species. 
Also the scales are larger and thicker and those of the dorsal line stronger. 
