CyPB.INID-'5. 



Synopsis of the Genera. 



I. Phar3nigeal teeth in a single series, exceedingly numerous, and 



closely set. Dorsal fin elongate, opposite to ventrals ; anal 

 fin short. Barbels none. Catosxomina. North America and 



North-eastern Asia, 



Dorsal fin with about 17 rays ; lateral line present, 



1. Catostomus, p. 12. 



Dorsal fin with about 17 rays : lateral line none. 



2. MoXOSTOMA, p. 20. 



Dorsal fin with about 30 or more rays ; pharyngeal bones sickle-shaped, with 

 the teeth compressed and increasing in size downwards. 



-\. SCLEROGNATHUS, p. 22. 



Dorsal fin with about 30 or more rays ; pharyngeal bones thin and compressed, 

 with a series of nearly equally minute compressed teeth. 



4. Carpiodes, p. 24. 



II. Pharyngeal teeth in a single, double or triple series, in small 



number, the outer series never containing more than seven 

 teeth. Never more than four barbels, if any. Air-bladder 

 present, without osseous covering*. 



A. Anal fin very short, with five or six (exceptionally seven f) 

 branched rays. 



1. Lateralline runninq along the median line of the tail. Dorsal 

 Jin opposite to vtntrals. Cyprinina, 



a. Dorsal fin with more than nine branched rays. 



a. Vharyngeal teeth in three series, the outer molar-like. 

 An osseous dorsal ray 5. Cyprinus, p. 25. 



* The following fish are so insufiiciently described that their systematic posi- 

 tion cannot be ascertained from the accounts given : — 



1. Cyprinus potail, Sykes, Trans. Zool. Sac. ii. p. 354. — Beema River, Dekkan. 



2. Leuciscus nesogallicus, Cuv. 8f Val. xrii. p. 310. — ^If the specimens to which 



this name has been given really are from the Mauritius, they cannot 

 belong to Leuciscus, as this genus is absent from Tropical Africa as well 

 as India.— D. 9. A. 12. L. lat. 45. 



3. caverii, Jerdon, Madr. Journ. Lit. ^ Sc. xv. p. 320. — Cavery River.— 



A. 6. 



4. flavus, Jerdon, I. c. — Carnatic. — A. 6. 



5. xanthogramme, Jerdon, I.e. p. 321. — Mysore and Carnatic. — A. 6. 



6. microcephalus, Jerdon, I. c. — Madras. 



7. argenteus, BasilewsJcy, Nouv. Mem. Soc. Net. Mosc. 1855, x. p. 2.32. 



— Pekin. — A. 9, abdomen carinatum. 



8. presbyter, C. # V. xvii. p. 307.— Bombay.— D. 11. A. 7. L, lat. 26. 



9. rubripes, Jerdon, I. c. p. 322. — Bowany River. 



t Compare Barhm obtusirostris (p. 121), Barbus lawaJc (p. 149), and Hybo- 

 gnathus regius (p. 185), which have ten or eleven anal rays. 



