272 



TI. S. P. R. R. EXP. AND SURVEYS ZOOLOOT — GENERAL REPORT. 



The scales arc large, and tlic liid'ral lino gently deflexed upon the ahduminal regii)n. The 

 color is red<liKh hmwii above, rather more yellowish beneath, with the middle of the flanks 

 silvery, and l)lack dots along the trade of the lateral line. The fins are nnicolor. 



Lisl of specimens. 



MONIANA, Girard. 



Gen. CiiAn. — Body compressed, sub-fusiform. Head rather small, Bub-conical or rounded. Snout occasionally protruding 

 slightly. Mouth sub-oblique, terminal ; both jaws generally equal. No barbels. Isthmus narrow. Eyes moderate. Caudal 

 fin furcated. Scales deeper than long, witli radiating furrows upon their posterior section alone. These characters, so far, are 

 found in I'lar^yrus. But now for the diffcrpuoes. The insertion of the venlrals is situated in advance of the anterior margin 

 of iho dorsal, which is higher than long. The pharyngeal teeth are compressed, of the raptalorial kind, of llic hooked typo, 

 without grinding surface, instead of wliich a sharp ridge is observed, very minutely crenatcd. Tlicy are disposed upon a singlo 

 row of four, llnis : 4 — 4. 



SvN.— Jl/<mi«»m, Grd. in I'roc. Acad. Nat. Sc. Thilad. VIII, 185G, 109. 



Tliis genus is composed of small species, all of which being provided with scales similar in 

 their general outline to those of Plargyrus and Cyprinella. 



\. MONIANA LUTIIENSIS, Grd. 



Si'Kc. C'hah. — Body sub-fusiform, elongated; back slightly convex. Head contained three times and a half in the total length. 

 Eye moderate, sub-circular ; its diameter entering four times in the length of the side of the bead. Jawseipial; posterior 

 extremity of nnixillar bone not reaching a vortical lino drawn at the anterior rim of the orbit. Anterior margin of dorsal fin 

 e(|uidistant between the tip of the snout and the base of the caudal. Insertion of ventraU situated in advance of the anterior 

 edge of the diirsal. Pecti)rals slender; their tijis not reaching quite the origin of the ventrals. Bluish black or hnnvn; dorsal 

 fin yclloMish brown ; other lius reddish. 



S¥N.— /.<wn«K.i lidraim, B. & C. in Proc. Acad. Nat. Sc. Philad. VI, 1853, 301 ; &, in Miirry's Expl. of Red Riv, of La. 

 1853, a.'il, Zool. pi. xiv. figs. 0—12. 

 Mmiimia lulrcnm, Giii). in Proc. Acad. Nut. Sc. Pliilad. VIII, 18.50, 109. 



The body is very much compressed and sub-fiisiform in general ajipcarance, somewhat tapering 

 from the posterior margin oi' the dorsal and anal fins to tlie caudal, tlie base of whicii is broader 

 than the peduncle of the tail. The greatest depth is equal to the length of the head, which is 

 contained three times and a half in the total length, the caudal fin included. The greatest 

 thickness is nearly equal to half of the depth. In general aspect it resembles Lu.rUus ken- 

 tuvlcicnsh of Dr. Kirtland. The eyes are of medium size, sub-circular ; their diameter being 

 contained four times in the length of the sides of the head. The nostrils, situated towards the 

 upl)cr surface of the head, are nearer the eyes than tlie tip of the snout. The posterior 

 extremity of tlie maxillary does not roach a vertical line drawn at tlie anterior rim of the orbit. 



The upper and posterior margins of the opercle constitute a unitbrm curve, whilst the anterior 

 and inferior margins are straight, forming together a rather acute angle. The sub-opercle and 

 inter-opercle are comparatively small. 



