GENUS CATOSTOMUS. 157 



in Ptycbostoraus; the teetli are blunter and larger comparatively than iii any 

 other genus of the tribe, increasing more rapidly in size from above downwards, so 

 that those of the middle of the arch are lilready of the same cast as those of the lower 

 part of the comb ; their crown is blunt and the inner edge rises into a blunt cusj)." — 

 (Agassiz, Am. Joiirn. Sc. Arts, 1855, p. 207.) 



MiNO.MUS Girard, 185G. — " We propose to include under the head of Aliiwmus, such 

 species as are characterized by an elongated and fusiform body, a head longer than 

 deep; a dorsal fin either higher than long, or with both dimensions equal. The l.ps 

 being tuberculated, moderately bilobed. The pharyngeals not expanded laterally, but 

 considerably bent inwardly. The teeth compressed, decidedly bicuspid, but the inner 

 projection more developed than the outer. The scales being nearly of the same size, 

 but slightly smaller anteriorly than posteriorly." (Includes C. insujnis, C.plebtius, and 

 C. cZaj-Aa.)— (Girard, Proc. Ac. Nat. Sc. Fhila. 1856, p. 173.) 



AcoMUS Girard, 1856. — "And then giving the name of Acomus to those tpecies in 

 which the head is very elongated, the dorsal higher than long, and the scales much 

 smaller upon the anterior region of the body than upon the posterior. The lips being 

 papillated and very deeply cleft. The pharyngeals are gently arched and not expanded; 

 the teeth compressed and bituberculated^ the inner projection conspicuous ; the outer 

 one obsolete, though existing." (Includes Cforsterianvs, C. aurora, C. latipinnis, C. (juZ' 

 manienhis, C. generosus, C. gnseits, and C. lactarius.) — (Girard, Froc. Ac. Nat. Sc. Fhila. 

 1856, p. 174.) 



Catostomus Girard, 1856. — "The genus Caioslomus, Le Sueur, would then be re- 

 stricted to such species in which the head is moderately elongated, the dorsal fin gen- 

 erally longer than high, and the size of the scales less disproportionate anteriorly and 

 posteriorly than in Acomus. The lips are i>apillated and deeply cleft. The pharyngeals 

 provided with a little expansion inferiorly. The teeth are comxjressed, with the inner 

 projection of the Crown alone developed." (Includes C. liadsonius, C. communi», C. occi- 

 dentalis, C. lahiatus, C. macrochdlu's, C. suclclii, and C. hcrnardini.) — (Girard, Froc. Ac. 

 Nat. Sc. Fhila. 1856, p. 174.) 



CATASTOMU.S Gill, 1865. — "Snout long. Lateral line present, nearly straight. Lips 

 papillated." — (Gill, Canadian Naturalist, Aug. 1865, p. ID, reprint.) 



Catostomus Giinther, 1868. — " Scales of small, moderate or large size. Lateral lino 

 present, running along the middle of the tail. Dorsal fin of moderate extent, with not 

 more than about seventeen rays, opposite to the ventrals, without si)ine. Anal fiu very 

 short, but deep. Fins of the males generally more i^roduced than those of the females, 

 and frequently with horny tubercles. Mouth inferior, with the lips more or less thick- 

 ened and papillose, the lower frequently bilobed. Barbels none. Gill-rakers well 

 developed, soft, the upper lanceolate, the lower quite membranaceous, low folds cross- 

 ing the bone. PseudobranchijE. Pharyngeal bones sickle-shaped, armed with a comb- 

 like series of numerous compressed teeth, the teeth becoming larger and broader 

 towards the lower end of the series." — (GCntuer, Cat. Fishes Frit. llus. vii, p. 12.) 



Catostomus Jordan, 1876.— "Air bladder in two parts ; lateral line well developed; 

 lips papillose ; scales much smaller anteriorly than posteriorly ; interorbital space 

 convex; body sub-terete."— (Jordan, Man. Vert. 1876, p. 292.) 



Hvpentelium Jordan, 1876. — "Air bladder in two parts ; lateral line well devel- 

 oped ; lips papillose ; scales about as large on front part of body as on tail; body 



