358 L. Agassiz on Fishes of the Tennessee River. 
Hysoprsts,* Agass.—So little attention has thus far been paid to 
the generic differences existing between the American Cyprinoids 
that it is not surprising to find several yet unnoticed. Among 
others I mention here a new type remarkable for its slender elon- 
gated form, its long head, its obtuse prominent snout, its inferior 
mouth and the advanced position of the anal. This genus is 
founded upon a small species from Huntsville. Leuciscus Sto- 
rerianus, Kirtland, which 1 have however not examined in na- 
ture, may be another species. 
Hybopsis gracilis, Agass.—Body much elongated and slightly 
compressed; head long, equalling nearly one-fourth the entire 
length of the fish. The snout is very short and broadly rounded ; 
the nostrils are large, above the middle line of the eye and nearer 
the end of the snout than the centre of the eye. The eyes are 
very large in proportion to the size and width of the head; the 
horizontal diameter which is slightly the longest, equals one-third 
the length of the head, their upper edge is on a line with the top 
of the head, the lower edge with the anterior edge of the mter- 
maxillaries and the extremity of the upper maxillaries reaches 
the line of their anterior border. The fins are all long an 
pointed. The pectorals are low down on the sides and reach the 
base of the ventrals. The hinder base of the dorsal is midway 
between the end of the snont and the extremity of the tail. 
The height of the dorsal is one-third greater than the length of 
the base; the second and the third rays longest ; number total of 
rays 8, and two united as one for the last ray of the fin. e 
base of the ventrals is below the anterior part of the dorsal ; their 
extremities reach nearly to the anal fin. The distance of the 
anal from the base of the tail is equal to twice the length of its 
own base. ‘Ihe anal is like the dorsal in form, but smaller, num 
ber of rays 7, with a last double ray. Caudal long, deeply fur- 
cate, the lobes being slender and pointed. 
Curosomus, Rafin.—The fish for which Rafinesque es ablished 
this group in his genus Luxilus, well deserves to be considered as 
* While these pages were setting in type, I have dee another pretty species 
i I. H. Ra 
uch, from Burling? 
make some additions 
fashion of Catostomus, so much so that had I not had ample opportunity te on 
ine young Catostomi, and to study the changes they undergo with age, might ver 
is f i enus. Moreo 
that gel } 
the lips are not swollen nor thickened. The pharyngeal teeth differ also ep 
in each main row, and one or two in a second row.” was thy geet 
is new species differs from that of Huntsville, by its smaller size, its 
pointed snout and the P pelea coloration. A deep black marrow band exten f the 
the neck to the base of the caudal along the whole back, dividing in advance of © 
niting a ind it upo’ 
wey 
color and a deeper rose-colored spot upon the base of the first ray of 
shall call this species H. dorsalis, Ag. 
id 
