FOSSIL FISHES. 41 
way between the occiput and the base of the caudal fin. In the fishes 
named J. lineatus the body is shorter and broader, the sides are more dis- 
tinctly lined, and the dorsal fin is set. farther back. 
Found in considerable numbers at Boonton, N. J., but up to the present 
time not obtained from any other locality. 
Type specimens in the geological museum of Columbia College. 
IscHYPTERUS MACROPTERUS W.C. R. 
Pl. XII, Fig. 1. 
Fishes six to eight inches in length by one and a half to two and a half 
inches broad, long-ovoid or fusiform in outline, symmetrically arched above 
and below; head large, one quarter the entire length, conical in outline; 
fins relatively large and strong; dorsal opposite the interval between the 
anal and ventrals, point of insertion nearer to the extremity of the tail than 
to the muzzle, fulera fifteen, rays eight ?; caudal broad, rays and fulera 
strong; anal reaching to base of caudal, fulcra fifteen, rays ?; scales rela- 
tively thick; ribs and spimous processes strong, and often distinctly showing 
in the fossil state. 
W. C. Redfield’ describes very briefly a species of Ischypterus, which 
he calls Palwoniscus macropterus, in the following words : 
Palwoniscus macropterus W. ©. R.—Long-finned Paleoniseus. This species is dis- 
tinguished by the longitudinal extension of the dorsal and anal fins; which thus seem 
to present « remote resemblance to the wings or forked tail of the common swallow. 
Its length is commonly from five to seven inches, and its width from one and a‘half 
to two inches. 
Among the large number of fossil fishes which have been collected at 
Boonton, N. J., the most abundant are such as were regarded by the Messrs. 
Redfield as representing Agassiz’s species Ischypterus fultus. They are gen- 
erally fusiform in outline, six to eight inches in length, and all have in marked 
degree the strong fin-fulcra characteristic of the genus. There are, how- 
ever, two groups of these fishes having about the same average size, one 
more slender and coming nearer to those which, sent from the Connecticut. 
Valley, were described by Agassiz with the name of Palwoniscus fultus; the 
'Short Notices of American Fossil Fishes, Am, Jour, Sci., vol. 41, 1841, p. 2. 
