336 THE CYPRINOIDS OF CENTRAL NEW JERSEY. 
Cope,* from a specimen we sent him, and has since been f 
by the writer.t During the interval, from the time of first 
tecting this peculiar species until the present summer, we 
never met with even a single specimen ; the few small fishes 
posed to be this species, and referred to by us, in the 4th vol 
the NATURALIST, proving to have been young of other fish 
had we properly studied at the time the anatomy, instead 
lying upon the external appearances, such an error would n 
occurred. The statement then made, however, is now correct 
the abundance of this species in some localities is very re 
able. 
During the present summer, Prof. A. C. Apgar and the 
fished, with a large seine made of mosquito netting, & 
formed by the united waters of a large spring and the inf 
current of the Delaware and Raritan Canal. To our surpi 
found the cyprinoidal fauna to consist wholly of this speci 
sociated with the “roach” and the three small ‘minnows; 
bopses. We procured over one hundred specimens, and from we 
note the following with respect to their size and appearance. 27 
adult size is probably five inches; the largest specimen takei 
us measuring within a small fraction of that length. The 
which, both in, the drawing given by us, as above referred | 
in that given by Girard of H. argyritis, in the tenth vol. Fs 
R. R. Survey, is oval, is in the adult living fish, nearly, if not@ 
circular, and less oval in the young living fish, than repres 
After long immersion in spirits, we notice that the eye is 0 
rather than circular. Otherwise, externally, we note no Y 
from Prof. Cope’s description. It is given, by Prof. Cope 
the length of the intestinal canal, which is a generic char 
in Hybognathusy four times the length of the fish. 
measurement of the intestines, in over fifty dissections, 
length, in Hybognathus osmerinus, to vary with age, ang ©" 
never less than five and one-quarter times the total length. 
is a considerable difference, even in fish measuring only 
inches in length. Unlike the fourteen other € 
the same streams, the peritoneum in this species is uni 
intensely black. Examination of the contents of the 
showed an exclusively vegetable diet, which was indicated 
: * Proc. Amer. Phil. Soc., vol. 11, p. 466 (foot note) 
T AMER. NATURALIST, vol. 4, P- 
we 
