20. Mugil heterochilus Blkr. 



Mugil heterocheilos Bleeker, Nat. Tijdschr. Ned. Indie IX. 1855, p. 198; ibid. 



XVI. 18581859, p. 280. 

 Mugil heterocheilos Bleeker, Act. Soc. Sc. Indo-Neerl. VIII. 1860, I3de Bijdr. 



Vischfauna Celebes, p. 57. 



Mugil heterochilus Giinther, Cat. Brit. Mus. III. 18591861, p. 457. 

 Mugil heterochilus Max Weber, Jenaische Denkschr. VIII. 1895, p. 108. 

 Mugil heterocheilus Max Weber, Siboga-Exp. Fische 1913, p. 141. 



D 1 . IV; D 2 . 1. 8; A. III.9; L.I. 40 41; L.tr. 12 13. 



Rostro-dorsal profile horizontal, anteriorly slightly convex. 

 Height somewhat more than length of head, 5 to 5 ! / 3 times 

 in length with caudal. Head about 5 to 5 3 / 4 times in length 

 with caudal *). Eye 3 or more in length of head, nearly i 1 / 2 in 

 its postorbital part ; no gelatinous membrane. Interorbital space 

 only slightly convex, nearly as broad as half length of head. 

 Snout slightly convex, shorter than eye. Praeorbital somewhat 

 emarginate, squamate, only its posterior border finely denti- 

 culate. Maxillary invisible or nearly so when mouth is closed. 

 Upper lip very thick, high, forming frontborder of snout, infe- 

 riorly with an indistinct series of obtuse low papillae which 

 may be wanting 2 ) ; lower lips not papillate, emarginate at 

 symphysis. Symphysial knob double. Origin of first dorsal 

 separated from snout by 20 praedorsal scales, about midway 

 between end of snout and base of caudal or somewhat nearer 

 to caudal, opposite to I2th 13^ lateral scale. Dorsal spines rather 

 weak, longer than postorbital part of head, but lower than 

 second dorsal and anal, which are concave and scaly. Origin 

 of second dorsal opposite to 24^ 25^ lateral scale and somewhat 

 behind origin of anal. Caudal emarginate, its base scaly. Pec- 

 torals equal to or somewhat longer (in small specimens shorter) 

 than head, not reaching origin of first dorsal; an axillary 

 scale on pectorals is wanting or small, but present on axil of 

 ventrals and at base of first dorsal. Least height of caudal 

 peduncle less than i ! / 2 times in its length, nearly twice the 

 length of head. Silvery, olivaceous above, generally a dark 

 spot superiorly at base of pectorals. Fins yellowish. Length 

 228 mm. 



1) The valuation of height and head is taken from BLEEKER'S description as 

 We dispose of small specimens only, .less than 100 mm. 



2) Their presence depends perhaps on sex or on season of rut. 



