CYPRTNID^. 7 



j3. Vent and anal J!?i in a sheath covered wifh enlarged, tiled scales. 

 Body scaly. Pharyngeal teeth in a triple series. 

 Mouth transverse, inferior. Mandibles broad, short, and flat, loosely joined 

 together ; margin of the lower jaw with a horny Liyer. 



24. Ore'inus, p. 100. 



Mouth arched. Mandibles of usual length and width. 



25. ScHizoTUOKAx, p. 162. 



y. Vent and anal fin in a sheath, covered with enlarged, tiled scales. 

 Pharyngeal teeth in a double series. 



Body scaly ; structure of the mouth without peculiarities. 



26. Ptychobaebus, p. 169. 



Body naked ; structiu-e of the mouth without peculiarities. 



27. Gymnocypris, p. 169. 



Body nearly entirely naked ; margin of the lower jaw transverse, cutting, covered 

 with a horny layer; barbels none 28. Schizopygopsis, p. 170. 



Only a part of the side is scaly ; mouth ciu-ved ; lower jaw with a cutting margin, 

 covered with a horny layer ; barbels two. 29. Diptychus, p. 171. 



S. Pharyngeal teeth in a single series. Body naked. No anal sheath. 

 Dorsal fin with a serrated spine 30. Auloptge, p. 171. 



e. Pharyngeal teeth in a double or single series. Body entirely scaly ; 

 no anal sheath. 

 Barbels two ; mouth inferior ; intermaxillaries protractile. Pharyngeal teeth 

 5/3 or 2 — 2 or 3/5. Intestinal tract short. 31. Gobio, p. 172. 



Barbels two or none ; mouth inferior ; Pharyngeal teeth 5 — 5. Dorsal fin con- 

 spicuously in advance of ventral, without stiff ray. 



32. PSEUDOGOEIO, p. 174. 



Barbels two. Pharyngeal teeth 4/1 or — or 1/4. Dorsal fin not, or but slightly 

 in advance of ventral 33. Ceratichtuys, p. 176. 



Barbels two ; mouth anterior. Pharyngeal teeth 5 — 5. Origin of the dorsal flu 

 in advance of that of ventrals 34. Bungia, p. 179. 



Barbels none. Dorsal fin with a stiff ray in front. Lateral line incomplete. 



35. PiMEPUALES, p. ISO. 



Barbels none. Dorsal fin with a stiff ray in front. Lateral line complete. 



36. Hyboriiyxchus, p. 181. 



Barbels none. Mouth inferior ; Lntermasillaries protractile ; lower jaw with a 

 sharp margin. Pharyngeal teeth 4 — 4. Air-bladder enveloped by the convo- 

 lutions of the intestine 37. Campostoma, p. 182. 



Barbels none. Mouth anterior. Intermaxillaries protractile ; lower jaw with a 

 rather sharp edge. Litestinal tract with numerous convolutions. 



38. Hybogxathus, p. 183. 



Barbels none. Mandibulary and opercular bones with muciferous cavities. 



39. Ericymba, p. 185. 



Mouth very small, transverse, directed upwards ; mandible with a hard, tren- 

 chant edge 40. Pseudorasbora, p. 185. 



Jaws with spoon-shaped bony expansions, their edge being trenchant as in 

 Tetrod&n 41. Cochlognathus, p. 186. 



Mandibles united by a broad symphysis, the svmphysial portion being promi- 

 nent, narrow, tongue-shaped, sharp 42. Exoglossum, p. 187. 



IntermaxiUaries not protractile. Pharyngeal teeth 4/1 — 2/4. 



43. EnisiCHTHYS, p. 188. 



