FISHES—CYPRINIDAE-EXOGLOSSUM. 
255 
HYBOPSIS, Agass. 
Gkn. Char.— Body elongated, compressed, sub-fusiform in profile, covered with rather large scales. The lateral line being 
straight along the middle of the flanks. The head is of moderate size, sub-conical and rounded upon the snout, which protrudes 
beyond the lower jaw. A barbel, inserted upon the anterior margin of the posterior extremity of the maxillary, may be seen at 
the angle of the mouth. The eyes are large, the isthmus narrow The dorsal is a little higher, and the anal deeper, than long. 
The insertion of the ventrals takes place opposite the second ray of the dorsal, hence very nearly under its anterior margin. 
The tail is deeply furcated. The pharyngeal bones have the same form and appearance as in Hudsonius; the teeth are likewise 
of the same kind (bruising) and type (hooked with a grinding surface), but more irregular yet. Sometimes not hooked, the 
grinding surface contorted and nearly absent, or even resembling a truncated cone. They are disposed upon a double row of 
four and one: 1 | 4—4 | 1, or 0 | 4—4 | 1. 
Syn. — Hybopsis, Agass. in Arner. Journ. of Sc. Second series, XVII, 1854, 358.— Grd. in Proc. Acad. Nat. Sc. Philad. 
VIII, 1856, 210. 
This genus, it will appear, is intimately related to Hudsonius , from which it chiefly differs 
by the presence of barbels at the angle of the mouth, and by its straight lateral line also. 
It was left rather vaguely defined hv its author, for there are many genera in which u the 
mouth is protractile downwards, after the fashion of Catostomus ,” with the lips neither swollen 
nor thickened. And many other genera, too, in which there is “only four or five compressed 
and hooked teeth in each main row, and one or two in a second row.” What is really of 
generic value is left for us to conjecture, siuce we are not in possession of its typical species. 
The generic characters which we now offer are based upon Leuciscus storerianus and a new 
species from Alabama ( Hybopsis ivinchelli, Proc. Acad. Nat. Sc. Philad. VIII, 1856, 211), and 
should they prove generally distinct from Hybopsis gracilis , Agass., a new name will have to 
be coined for our species. 
TRIBE OF ALBURNI. 
The genera brought together in this tribe are numerous, and quite as diversified in their 
dentition as in the former group. They differ from the latter by the absence of barbels. As 
in the preceding, the teeth are of the hooked types, with or without grinding surface ( Dentes 
uncinato-submolares et uncinato-subconici) , mostly of the raptatorial kind ( Dentes raptatorii). 
In the majority of cases, the teeth are disposed upon a double series also. 
This group was first distinguished in the “Proceedings of the Academy of Natural Sciences 
of Philadelphia, vol. VIII, 1856, 190.” 
EXOGLOSSUM, Rafin. 
Gen. Char. —The body is elongated, sub-cylindrical, somewhat compressed. The head is sub-conical, flattened at the 
occiput, and terminated by a blunt snout. The mouth is sub-terminal, opening downwards and forwards, the lower jaw being 
shorter than the upper and not surrounded by the lips around its symphysis, the lips being largely developed at the angle of the 
mouth and along the upper jaw also. The eye is of moderate size. The isthmus is wide. The origin of the ventrals is situated 
opposite the anterior margin of the dorsal or posterior to it. The caudal is furcated. The scales are rather large. The 
pharyngeal bones are exiguous, very slender upon their inferior branch, hardly dilated above. The teeth are of the raptatorial 
kind of the hooked type, without grinding surface, instead of which a sharp, but not crenated, edge. They are disposed upon a 
double row of one and four, thus: 1 | 4—4 | 1. 
Syn. — Exoglossum, Rafin. in Journ Acad. Nat. Sc. Philad. I, 1,1818, 419.— Heckel, in Russeg. Reisen, I, n, 1842,1 023.— 
Cuv. & Val. Hist. nat. Poiss. XVII, 1844, 480.— Storer, Synops. 1846, 176.— Agass. in Amer. Journ. of 
Sc. 2d series, XIX, 1855, 215.— Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 191. 
