BAGRUS. 305 



Head 1? to li times as long as broad ; last ray 

 of dorsal in advance of ventral ; maxillary 

 barbel extending to end of pectoral or a 

 little beyond in the adult, to ventral in the 

 young i. B. degeru, Blgr., p. 311. 



B. Distance between rayed dorsal and adipose fin at least equal to base of 

 latter. 

 Head not more than 1^ times as long as broad ; 



maxillary barbel much longer than head ; 



anal with 10 or 11 rays 5. B. urostigma, Vincig., p. 312. 



Head nearly twice as long as broad ; maxillary 



barbel shorter than head G. B. meridionalis, Gthr., p. 312. 



II. Occipital process not longer than eye, 

 widely separated from first interncural 

 bone ; head li times as long as bread ; 

 rayed dors;d and adipose fin narrowly 

 separated ; maxillary barbel extending 

 beyond base of ventral; anal with 11 

 rays (7 branched) 7. B. ubangensis, Blgr., p. 313. 



1. BAGRUS BAYAR 

 Silurus bajad, Forsk. Descr. Anim. p. 66 (1775). 



Porcus baycul, I. Geoffr. Descr. Egypte, Poiss. p. 303, pi. xv. fius. 1 k 2 (1827). 

 Bagrus bayad, Hupp. Beschr. n. Fisehe Nil, p. 5 (1829); Cuv. & Val. Hist. Poiss. 



xiv. p. 397 (1839); Giinth. Cat. Fish. v. p. 69 (1864), and Petherick's Trav. 



ii. p. 227 (1869); Bouleng. Fish. Nile, p. 321, pi. Ivii. (1907). 

 Bagara Bachika, liifaud, Voy. Egypte, pi. exciv. (1830). 



Depth of body <±.\ to 5§ times in total length, length of head 3^- to 

 4 times. Head much depressed, If to If times as long as broad, smooth 

 above or finely striated on sides of elongate fontanelle ; occipital process 

 long and narrow, in contact with first interneural bone (which is hidden 

 under the skin) ; snout broadly rounded or truncate, projecting beyond 

 lower jaw, If (young) to 3f times as long as eye, which is 4J (young) 

 to 11 times in length of head and 1| to of times in intei ocular width ; 

 width of mouth 2\ to 2f times in length of head ; praunaxillary band 

 of teeth 6 or 7 times as long as broad, a little shorter than and about as 

 broad as or a little narrower than the band of vomerine teeth. Nasal 

 barbel \ (adult) to f length of head; maxillary barbel 2 (adult) to 3i| 

 times length of head, reaching extremity of ventral or anal in the adult, 

 caudal peduncle or caudal fin in the young ; outer mandibular barbel 

 1J to 2 times length of inner, and f to -§ length of head. Gill-rakers 



VOL. II. X 



