334 THE CYPRINOIDS OF CENTRAL NEW JERSEY. 
of individuals, that by less pronounced features link the f 
leaves little ground for doubting their being really, specifica 
distinct. It should be remembered, also, that the H. pha 
reaches a larger size than the H. Hudsonius, here in the Delawai 
and the “more conic form” of the snout cannot be ascribed 
maturer age, as has been done by Prof. Cope. Specimens thr 
H. 
half inches long, have the tapering profile, much as in the drawin 
given by Prof. Cope, and above referred to. In conclusion, 
must add that, in the figure given by Clinton, the circular b 
spot at the base of the caudal is a very marked feature. 
says in his description, “no spot at base of tail.” Now we be 
the truth to be, that the H. phaénna is also to be i 
the absence of the caudal spot, which we have never failed to 
on typical specimens of the H. Hudsonius. 3 
14. Alburnellus amænus Abbott. The discovery of this b 
tiful cyprinoid makes the second instance of a genus being re 
sented in the Delaware and Ohio rivers, and not in pos 
Fig. 78. 
Alburnus amenus. Natural size. 
termediate river system of the Susquehanna. It was first 
with, by the writer, in the summit level of the Delaware and ! 
itan canal, associated with Hybopsis Hudsonius, H. 
Hypsilepis analostanus and Hy. cornutus. 
We give the following descfiption of the species with 
(Fig. 78). Head shorter and broader than Alburnelli ge 
with the profile less pointed anteriorly to the orbit. Orbit 
equal to length of the muzzle, and entering length of head 
times; but a trace less than the interorbital space. ™ 
~ times in length to basis of caudal; greatest depth, four 
thirds (44) times to same. — 
| Phe figure was engraved without correction of the drawing on the block 
+ 
