274 
U. S. P. R. R. EXP. AND SURVEYS—ZOOLOGY—GENERAL REPORT. 
trapezoid in their outline, the anal being somewhat longer than the dorsal, and, likewise, deeper 
than long. Both of these fins are sub-concave upon their external edge ; the anterior margin 
of the anal is equidistant between the isthmus and the fork of the caudal. The ventrals are 
obtusely rounded upon their posterior margin ; their tips overlapping the vent and reaching the 
origin of the anal. The pectorals are sub-lanceolated ; their extremities not extending as far 
hack as the insertion of the ventrals. The rays are : 
D 2, 9 + 1; A 2, 9 + 1 ; C 5, 1, 9, 8, 1, 7 ; V 1, 8 or 9 ; P 16. 
The scales are remarkably deep, rather sub-truncated anteriorly, rounded posteriorly, and 
rather tapering superiorly and interiorly. 
The upper region is greyish brown, whilst the flanks and the abdomen are dull yellowish or 
whitish, with a somewhat metallic reflect. The dorsal and caudal are greyish yellow ; the rest 
of the fins light sulphur yellow. 
Ee/erences to ike figures .—Plate LIX, fig. 6, represents Moniana leonina, size of life. Fig. 7 
is a section of the body taken across the line of greatest depth. Fig. 8, a dorsal scale. Fig. 
9, a scale from the lateral line. Fig. 10, a scale from the abdominal region. 
List of specimens. 
Catal. 
Corr. No. 
So of: Sex and age. 
Locality. 
When col¬ 
Whence obtained. 
Orig’l 
Nature of 
Collected by— 
No. 
of teeth. 
spec. 
lected. 
No. 
specimen. 
115 
2701 
18 | Adult and young. 
Leon river, Texas. 
1853 
Lieut. A. W. Whipple .. 
11 
Alcoholic.. 
Dr. C. B. Kennerly .. 
3. MONIANA DELICIOSA, G r d . 
Spec. Char. —Body slender and elongated. Head constituting the fifth of the total length. Snout sub-conical ; upper jaw 
overlapping the lower. Posterior extremity cf the maxillary extending to a vertical line drawn between the nostrils and the 
orbit. Eye large and circular ; its diameter entering three times in the length of the side of the head. Anterior margin of 
dorsal fin equidistant between the tip of the snout and the insertion of the caudal. Pectorals and ventrals slender and of 
moderate development. Reddish brown above ; yellowish beneath ; middle of flanks silvery. 
Syn —Moniana deliciosa, Grd. in Proc. Acad. Nat. Sc. Fhilad. VIII, 1856, 199. 
This is one of the most slender of all the species hitherto known of the genus. Its length 
is a little over two inches and a half, the head forming the fifth part of it. The latter is 
proportionally small, suh-conical anteriorly. The eye is quite large and circular, its diameter 
entering about three times in the length of the side of the head. The dorsal is much higher, 
and the anal much deeper, than long ; the anterior margin of the anal is nearer the tip of the 
lower lobe of the caudal than the isthmus. The origin of the ventrals is equidistant between 
the tip of the snout and the insertion of the caudal; they are posteriorly sub-truncated, their 
extremities extending as far as the vent. The pectorals are slender, suh-ovate in their outline, 
and, in being brought alongside the body, they do reach the insertion of the ventrals. The 
caudal is deeply furcated, longer than the head, and contained four times and a half in the 
total length. 
D 2, 8 + 1; A 2, 7 + 1 ; C 6, 1, 9, 8, 1, 7 ; V 1, 8; P 13. 
There are ten longitudinal rows of scales upon the greatest depth of the body; the scales 
themselves are large. The lateral line being slightly deflexed upon the abdominal region. 
The color of the dorsal region is reddish brown, whilst the abdominal region is yellowish. 
A silvery streak may he observed along the middle of the flanks-above the lateral line, which 
