31. CYPRINID^ — PHENACOBIUS. 
205 
8S.— PHEIVACOBIUS Cope. 
(Sarcidinm Cope.) 
(Cope, Proc. .load. Nat. Soi. Phila. I8i37, t)i): typo Pht'iiacobim teretul us Coita.) 
Body eloagtite, little compressed. ]\Iouth inferior, the lower lip thin, 
mesially, bat enlai'ged into a fleshy lobe on each side toward the angle 
•of the month, thus presenting a superficial resemblance to that of Exo- 
glossum, with which the genius has probably real affinities j upper lip 
with a callous covering within; dentary bones distinct, except at sym- 
physis. iTo barbel. Upper jaw protractile. Teeth 4-4, hooked, with- 
out grinding surface. Scales rather small. Lateral line complete. 
Dorsal fin in front of ventrals ; anal basis short. Isthmus extremely 
wide. Intestines short; peritoneum white. Small species, with the 
aspect of youug suckers. deceptive ; (3co?, life; the appearance- 
of the fish sxiggesting an herbivorous species with long intestines, which 
it really is not.) 
* Scales moderate, 43-50 in the course of the lateral line. 
30J>. P. teretuliis Cope. 
Body slender, little compressed, the back not elevated, the caudal pe- 
duncle stout. Head stout, the muzzle elongate, obtusely decurved, 
heavy. Mouth small, inferior, horizontal, the maxillary not reaching to 
eye. Isthmus wide. Breast scaly. Lateral line nearly straight. Eye 
large, high up, 3.^ in head. Pale yellowish ; the scales above dark- 
edged ; snout blackish ; a plumbeous lateral band ; fins i)lain. Head 4§ ; 
depth 4|. D. 8 ; A. 7 ; scales G-43-5 ; teeth 4-4. L. inches. Kan- 
awha River. 
(Cope, Proc. Acad. Nat. Sci. Phila. 1867 , 96.) 
310. P. mirabilis (Grd.) Jordan. 
Body moderately slender. Head short, rather blunt anteriorly. 
Mouth small, the maxillary not reaching to the eye. Eye large, 4 in 
head. Olivaceous; a silvery lateral band and a dusky spot at base of 
caudal. Head 4; depth 4|. D. 8; A. 7 ; scales 6-51-5 (teeth 1, 4-4, 1?). 
L. 3 J inches. Arkansas River. (Girard.) 
{Exoglossum mirabile Grd. Proc. Acad. Nat. Sci. Phila. 1856, 191, and U. S. Pac. R. R. 
• Surv. X, 256: Exoglossum mirabile GUnther, vii, 188: ? Sarcidium scopiferum* Cope, 
* Body moderately elongate, the hack not elevated. Caiidal peduncle stout. Head 
rather short and thick, with prominent but obtuse muzzle. Mouth small, horizontal, 
wholly inferior, the maxillary not reaching the eye. Top of head flat. Lateral line 
nearly straight. Eye largo, 41- in head. Yellowish, with a silvery lateral band, which 
terminates in a black caudal spot ; no do:,sal band; fins plain. Head 4.1; depth 4f. 
D. 8; A. 7 ; scales 6-44-5; teeth 4-4. L. 3 inches. {Cope.) Missouri River. 
