CYPRINID^. 59 



XX. Teeth one-rowed, with grinding surface, and tbo edges crenate- 

 serrate; belly sub-cariuato ; aliuieutary uanal t'loiigatc, 



NOTKMKJON us, 27. 



XXX. Teeth two-rowed, entire, without grinding surface ; aliuiuntary 



canal not elongate Ricuaudsoxiis, 2d. 



8S. Both jaws with a hard or cartilaginous brown horny pfate, large 

 and conspicuous; mouth inferior {ChondroHloiiiatincE) : 

 — . Teeth 5-4, club-shaped, entire, terminating in a hook, with the 

 inner (grinding) surface obli(]uely cut; anal tin elongate; 

 dorsal hn over ventrals; caudal tin with the accessory rudi- 

 mentary rays very largely developed; alimentary canal elon- 

 gate (?) AcuociiiiA's, 29. 



fff. Teeth usually (5-6, compressed, lanceolate, erect, very slightly bent inward, 

 one-rowed; body elongate; jaws even; scales small; dorsal 

 over ventrals; basal caudal rays largely developed ; lower jaw 

 sharp-edged, with a knob at the symphysis ; no pseudobrau- 

 chiai; intestinal canal elongate ; size large. ..Oiitiiodon, :iO. 

 ffff. Teeth in the principal row 3-3, without grinding surface; istbraus very 



wide; dorsal behind ventrals TiakoGA, 31. 



ee. Maxillary provided with a small barbel : 

 y. Premaxillaries not projectile, the skin of the lip and front continuous ; 

 teeth in the principal row 4-4, without grinding surface ; 

 scales small; dorsal behind ventrals ; barbel terminal : 



KniNicin iivs, 32. 



y,j. Premaxillaries projectile, a groove separating the upper lip from the 

 forehead : 

 z. Teeth without grinding surface : 



a. Teeth in the principal row 4-4; barbels terminal : 

 ft. Dorsal behind ventrals ; scales small : 



c. Lateral line incomplete Apocope, 33. 



cc. Lateral line complete (Subgenus?) Ekitukma, 34. 



U. Dorsal fin over ventrals ; lateral line complete NocoMis, 3o. 



aa. Teeth in the principal row 4-5; barbels lateral : 

 d. Dorsal fin over ventrals ; scales large, equal, 



(Subgenus ?)LEUCOSOMfS, .3b. 

 dd. Dorsal fin beginning over last rays of ventrals ; scales smaller, 



, " ,., Semotilus, 3/. 



crowded forward 



sz. Teeth with developed grinding surface : a n^,. -la 



e. Dorsal fin behind ventrals; scales small AGOsia, .30. 



ee. Dorsal fin directly over ventrals; scales large: 



/. Head compressed, rounded above Pogon ciinn., 3J. 



//.Head broad, much depressed, nearly flat or --ave ab v x 



bling thehe^Aoi^Cyprinodont Plat.gobio 4U. 



dd Teeth molar of the grinding type, without grooves or r.dges, ,n three rows 

 dd. Teeth molar, ot ^^._^^^^^^^ ^ ^^ ^^ ^^^ ^_^^ .^^ ^^ . „ , ^ 



the teeth blunt and much enlarged; body elongate; head 

 _. Angle of moS^h^a barbel; "PP- 3- iVe.y protract i^;^ 



ventrals - ,""',. A,.,,^„^ hp"-innin<' behind ven- 



. No barbel; upper jaw not protractile, dorsal '^«";;;^^;^,^,^^^^^ 4.,. 



{Cwlo^hori) : 



