FOSSIL FISHES. oe 
The scales of this species are relatively large and strong, and it is 
evident that the fish was firmly and robustly organized; hence the name 
eiven it. 
Up to the present time I have seen but two or three specimens, and 
these are all from Boonton, N. J. 
The type is in the geological museum of Columbia College. 
IscHYPTERUS ELEGANS, fl. Sp. 
Pl. VIL, Fig. 2; Pl. X, Fig. 1; Pl. XIV, Figs. 1, 2. 
Fishes small, length four to six inches, greatest breadth two inches; 
length of head one to one and a quarter inches, contained four and a half 
times in the entire length; body long-ovoid, elegantly arched; teeth rela- 
tively large, conical, acute; scales smooth, about twenty in each vertical 
row in broadest part of body, and thirty-two in a longitudinal series along 
the median line to the base of the triangle which extends into the upper 
lobe of the tail; erect, scales along dorsal line anterior to dorsal fin about 
twenty, relatively small, first four or five unarmed; head small, pointed, 
depressed ; fins small, weak. 
This is the neatest species of the genus known to me; the curves of 
the outline of the body are graceful, the scaling crowded but exact. In 
form it most resembles J. lineatus, but is smaller and broader, the back 
is more distinctly and regularly arched, and the scales are more numerous. 
Another peculiar feature in the outline is the sudden contraction of the body 
behind the dorsal fin. The scales are brilliantly polished, and each one 
usually retains its position, so that the surface and outlines of the fish are 
well preserved. From this it may be inferred that the scales were thicker 
and more firmly united than in most species of the genus. 
Collected at Boonton, N. J.; type specimens in the geological museum 
of Columbia College. 
IscuyPTERUS ALATUS, 1. Sp. 
Pl, VII, Figs. 1, 2. 
Fishes robust, eight inches in length by two and a half inches in great- 
est breadth; head large, nearly one-third of entire length; fins relatively 
