FISHES—C YPRINID AE-PIMEPHALES. 
233 
4. HYBORHYNCHUS CONFERTUS, Grd. 
Plate LIX, Figs. 11—15. 
Spec. Char.— Head constituting the fifth of the total length. Eye sub-circular; its diameter entering nearly four times in 
the length of the side of the head. Greatest depth of the body more than the length of the head. Caudal fin entering five 
times in the total length. Insertion of ventral fins situated opposite the anterior margin of the dorsal. Scales rounded upon 
their anterior edge also. Pale reddish above; yellowish beneath. A black spot at the anterior margin of the dorsal. Peduncle 
of tail with a dark streak along its middle. 
Syn. —Byborhynchus conferlus, Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856, 179. 
This species has a short and contracted appearance, resembling somewhat a diminutive Moxos- 
toma. The opercular apparatus acquires also a considerable development. Its body is covered 
with scales rather larger than those of H. puniceus, although smaller than the other hitherto 
known species of its genus. They are much deeper than long, convex upon the anterior as 
well as posterior edge, and provided with radiating furrows upon their posterior portion alone. 
The color is of a pale reddish tint above, and yellowish beneath ; a black spot being observed 
at the anterior margin of the dorsal. A dark narrow streak is seen on the middle of the 
caudal region. 
References to the figures. —Plate LIX, fig. 11, represents Hyborhynchus conferlus , size of life. 
Fig. 12, a section of the body across the line of greatest depth. Fig. 13, a dorsal scale. Fig. 
14, a scale from the lateral line.' Fig. 15, a scale from the abdominal region. 
List of specimens. 
Catal 
No. 
Corr. No. 
of teeih. 
No. of 
spec. 
Age. 
Locality. 
When 
collected. 
Whence obtained. 
Orig. 
No. 
Nature of specimen. 
Collected by— 
147 
2725 
20 
Adult and 
young. 
Hurrah creek, trib. of 
Eio Pecos. 
1853. 
Lieut. A. W. Whipple. 
XII 
Alcoholic. 
H. B. Mollhausen 
PIMEPHALES, Rafin. 
Gen. Char. —Body sub-fusiform when seen in profile, compressed, however, as usually. The head is large, short, and the 
8 nout very blunt. The mouth is small, slightly arched, and terminal; the jaws being even. The eye is of moderate development. 
The isthmus is proportionally wide. The dorsal fin is somewhat higher than long, provided anteriorly with a rather thick and 
undivided, short and hard ray. Caudal fin posteriorly emargioated. The origin of the ventrals takes place either immediately 
opposite the anterior margin of the dorsal, or else a little posterior to it. The scales are rather large, a good deal deeper than 
long, and the lateral line, after a slight deflection along the thoracic region, follows the middle of the flanks to the base of the 
caudal fin. The pharyngeal hones are of moderate stoutness, gently arched, the upper and lower limb nearly equal though the 
r.pper is more curved; the convex portion is regularly dilated or expanded. The teeth are of the cultriform kind of the grinding 
type, very slightly hooked, compressed, with a narrow grinding surface, and disposed upon one single row of four: 4—4. 
Syn. — Pirnephales, Rafin. Ichth. Ohiens. 1820, 52.— Storer, Synops. 1846, 166.— Agass. in Amer. Journ. of Sc. 2d series, 
XIX, 1855, 220.— Grd. in Proc. Acad. Nat. Sc. Philad. VIII, 1856,180. 
The type of this genus, P. promelas , is not uncommon in several of the small tributaries of 
the Ohio river. It would have added a great deal of interest to this report bad we had the 
opportunity of giving a good figure and a minute description of this fish. We hope the time 
is not far remote when we shall be prepared to complete our researches upon' the fresh water 
fishes of North America. . 
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