31. CYPRINID^K PHKNACOBIUS. 205 



88. PHENACOBIUS Cope. 



(Cope, Proc. Ac.:nl. Nat . Sr.i. Phila. H >7, '..'> : typo rii'mni-nlnnx teretulm Cope. ) 



Body elongate, little compressed. Mouth inferior, the lower lip thin 

 inesially, but enlarged into a fleshy lobe on each side toward the angle 

 of the mouth, thus presenting a superficial resemblance to that of Exo- 

 glossum, with which the genius has probably real affinities; upper lip 

 with a callous covering within; dentary bones distinct, except at sym- 

 physis. No 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 young suckers, (^vaf, deceptive; ,*:'"<?, life; the appearance 

 of the fish suggesting an herbivorous species with long intestines, which 

 it really is not.) 



* Scales moderate, 415-50 iu the course of the, lateral line. 



3O9. P. terctuBus 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 plain. Head 4 ; 

 depth 4f . D. 8 ; A. 1 ; scales 6-43-5 ; teeth 4-4. L. 3 inches. Kan- 

 ,awha River. 



(Cope, Proc. Aead. Nat. Sci. Phila. 1867, 9<>.) 



3 tO. 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. (Oirard.) 



(Exoglossum niirabile Grd. Proc. Acad. Nat. Sci. Phila. 1856, 191, and U. S. Pac. R. R. 

 Surv. x, 256: Exoglossum wirabile Giiuther, vii, 188: ? Sarcidium scopifermri* Cope, 



* Body moderately elongate, the back not elevated. Caudal 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 large, 4 in head. Yellowish, with a silvery lateral band, which 

 terminates in a black caudal spot. ; no do. sal tin. Head 4^ ; depth 43. 



D. 8; A. 7; scales 6-44-5 ; teeth 4-4. L. 3 inches. (Cope.) Missouri River. 



