BAEBUS. 203 



1. BARB US BYNNI. 

 (Plate XXXIV.) 



Cyprinus bynni, Forskal, Descr. Anim. p. 71 (1775) ; Gmelin, Syst. Nat. i. p. 1414 (1789) ; 



Sonnini, Voy. Egypte, iii. p. 400, pi. xxvii. fig. 3 (1799), or Trav. Egypt, p. 476, pi. xv. fig. 5 



(1800). 

 Cyprinus lepidotus, Greoffroy, Descr. Egypte, Poiss. pi. x. fig. 2 (1809). 

 Barbus binny, I. Greoffroy, op. cit. p. 282 (1827). 

 Barbus lepidotus, Riippell, Beschr. n, Fische Nil, p. 4 (1829). 

 Barbus bynni, Cuvier & Valenciennes, Hist. Poiss. xvi. p. 174 (1842) ; Gunther, Cat. Fish. vii. 



p. 104 (1868), and Petherick's Trav. ii. p. 261 (1869). 



Body deep arid strongly compressed, its greatest depth, at the origin of the dorsal 

 fin, two and two-thirds to three and one-third (exceptionally three and a half) times in 

 the total length, length of head four to five times. Snout rounded or subacuminate, 

 more or less prominent, its length three and one-fourth to three and three-fourths times 

 in that of the head ; diameter of eye three (young) to six times in the length of the 

 head, interorbital width twice and a half to three times ; mouth small, inferior, its width 

 one-sixth to one-fourth the length of the head ; lips well developed, sometimes very 

 strongly, the lower continuous across the chin and usually produced into a median 

 rounded or subtriangular lobe, which is shorter than the eye ; barbels two on each 

 side, varying in length, the anterior much shorter than the eye in the young, usually 

 nearly as long as the eye or a little longer in the adult, the posterior longer, usually 

 once and one-third to once and a half the diameter of the eye in the adult, the distance 

 between them measuring one-half (young) to one diameter of eye. Dorsal fin very 

 elevated, with the free edge emarginate, its rays IV 9, rarely 8, exceptionally 10 ; last 

 simple ray very strong, bony, smooth, deeply grooved behind, its ossified part usually 

 longer than the head (once and one-fourth to once and two-thirds), rarely not longer 

 than the head, and exceptionally slightly shorter; the distance of the dorsal from the 

 occiput equals, or nearly equals, its distance from the root of the caudal fin. Anal fin 

 with III 5 rays, variable in depth and sometimes nearly reaching the root of the caudal, 

 its longest ray measuring two-thirds to once the length of the head. Pectoral fin acutely 

 pointed, four-fifths to once the length of the head, not reaching the ventral ; latter origin- 

 ating below or slightly in advance of the first rays of the dorsal. Caudal fin deeply forked. 

 Caudal peduncle once to once and one-third as long as deep. Scales finely striated longi- 



6— 5— or 7— 



tudinally, 31-39 (usually 34-37) p (exceptionally 2 6 i 2 ), 3 (rarely 3^, exceptionally 4) 

 between lateral line and ventral fin, 14 (rarely 12 or 16) round caudal peduncle. 



According to the notes and sketches of Mr. Loat, the body, in the adult, is of a more 

 or less uniform dull yellow colour, turning to olive on the back. In specimens of 

 180 millim. and under, the whole fish is very silvery, steel-grey or olive on the back, 



2d2 



