10 



POLYPTEKID.E. 



4. POLYPTEHUS EXDLTCPIERI. 



llfckcl, Uussegger's Yii-ine Eo;y|,t. iii. \>. 'Md \>\. xxii. H;:. 1 (1840) ; A. Duni. 

 Hi.^t. Poiss. ii. )). :VX\, ]>\. xxiii. fi;;-. 3 (1870) ; Steind. Denksclir. Ak. Wieii, 

 xliv. 1882, J). 52, ]>U. viii. ct ix. fig. 2 : Boulcng. Ann. & ^lag. X. H. (7) ii. 

 1808, ]). 418, aiiil Proe. Zool. Soc. 1002, i. p. 124, \A. xi. fig. 2 ; Werner, 

 Zool. Jalirb.. Syst. xxi. 10O4. j.. 271, and Sit/.h. Ak. Wi.-n, c-xv. i. lOO*',, 

 p. 1118 ; Bouleng. Fish. Nile, p. 0, pi. ii. (10O7). 



J\>li/j>fi'riis seHe<ialensis, part., Giintli. Petlierick'.s Trav. ii. p. 21)8 (18r>0). 



robiptcrits hirhir, part, Giinth. Cat. Fi.-h. viii. p. :>2t; (1870;. 



Body more or less distinctly flattened, at least in front. Head \h to 

 1| times as long as broad, 4f to 5f times in total len<j:th, mncli flattened, 

 Avitli snpero-lateral eyes and flat or slightly concave interorbital region ; 





VA'^'>}y:^ 





J' 



X 



1' i-. ('.. 



*V~-^-^ 



White Nile (F. N.). I 



lower jaw projecting slightly beyond U[)[)er; length of snout •") to 7 tinn^s 

 in length of head ; eye (young) to 15 times in length of head, 2^ 

 (young) to o| times in the interocular width ; latter more than distance 

 betwecMi eye and spiracle; nasal bones in contact on the median line in 

 the adult; a series of 4 to 6 shields between jxtstorbital and spirarular 

 sliields ; suboperculutn niucli larger than eye. Dorsal witli Xl-Xl\' 

 spines, anterior not or but feebly overlapping when folded. Anal 15-18. 

 Pectoral reaching to or beyond vcMtical of flrst dorsal spine. 50-58 

 scales in a longitudinal series, 11-15 between occiput and first dorsal 

 spine, 42-40 round middle of" body. Grey or greyish olive above; \ to 

 6 niorp or less regular broad blackish bauds across the back; on lli<^ 



