PoLYPTKiJlD.T:. 



B. 52-61 scales along the body, ;J2-4<» round tlit- iniddli* ; interorbital 

 region convex, not more than 2 diameters of eye. 

 1. Peerorul reaching or nearly reaching first dorsal spine. 

 I^- X-Xl ; r>U scide.s in longitudinal series, '.lH 

 round niiddleof body, 14-1 7 l»('t\vct'n occijait 

 :irid first (h)rsul spine 7. 7^ (/c/Ar;/, lilgr., p. 13. 



'2. Pectoral widely separated from first d(jrsal spine, 

 i *. \ ill- XI; ;j.'j-()l scales in hnigitudinal series. 



.■)i-4() rouTiil middle of bo.lv. 1 .■)-2() between 



• •••eiput and first dorsal spine i<. P. senegalus, Cuv., p. 11. 



!'• \-lX ; r)2-5tj scales in longitudinal series. 



'M]-U) round nuddle of body, 'l',\-'li\ between 



occiput juiil first dt)rsal spine '.I. /^ y<,<///i,/.v, Avres, p. lo. 



I>. VT-YII ; :)ii-')\\ scales in longitudinal series, 



'M-'M') round middle of l)ody, Wh-'M lietween 



occiput and first dorsal s}>ine Iti. l'. nhoj.'nniis, \m\\., y. 17. 



1. I'(iLVi'Ti;i;r> i;i( iinj. 



GeottV. Ann. du Mu,-. i. lMi2. p. ')7. pi. v., and I)eser. Hgvpte, P«ii-s. j). 4, 

 pi. iii. (ISO'.)) ; (^uielien. Mag. /..ol. \i<\\\\ Poi-.<. p. 10; Giinth. Petherick's 

 Trav. ii. p. 2(;7 nSOl*) ; A. Dum. lii-t. Pois<. ii. p. .".'.tl, jd. xxiii. fig. 1 

 (1«7()) ; .Schw.'inf. Her/.. Afr. i. p. IaW, fig. (Us74) ; Steind. Denksejn-. Ak. 

 Wien, xliv. 1.S.S2, ji. f)-l, pis. viii. ^\; ix. fig. 1 : Bouleng. Ann. ct Mag. N. H. 

 (7) ii. IS'.t.S. p. 117: S. Flow.-r. Proe. Z,,,.!. Sue. UMK), p. iMlS ; W.rn.-r, 

 Zool. Jahri)., Syst. xxi. I'.MH, |,. i»71, an.l Sit/.b. Ak. Wien. exv. i. I'.MM;, j.. 1 1 IS ; 

 Bouleng. Fish. Nile, p. .5, j.l. i. (]'.M)7). 



/'oli/ptenis bicJiii\ jiait.. (liintii. Cat. Fish. \iii. p. '.VJu ( 1S70). 



Head twice or luarl) twice as long as hrojid, rather strongly flattened, 

 its length 4| to 5§ times in total length, witli supero-lateral eyes and 

 slightly convex interorbital region ; lout r jaw ])rojecting slightly l)eyond 

 npper; hMigth of snout 5 to 7 times in length of the head; eye 8A 

 (\oung) to lo times in length of the head, l§ (young) to 2* times in inter- 

 ocular width; latter less than distance between eye and spiracle ; nasal 

 bones in contact on the median line in the adult ; a series of 4 to 7 

 slii( his between postorbital and spiracidar shields ; subopercnlum much 

 larger than eye. Dorsal fin with XIV-XVlll spines; spines over- 

 lui»ping when folded down. Anal 11-15. Pectoral reaching beyond 

 vertical of first dorsal spine. C3-70 scales in a longitudinal series, 

 11-15 between occiput and first dorsal spine, 46-54 round middle of 

 body. Greyish or greenish olive above, the young with 10-1 o cross-bars 

 on the back and 2 or 8 stripes along tliv sides of u darker shade, these 



