820 ox FISHES OF THE FAMILY MOEMTIIID.E. [NoV. 16, 



Hyperopisus dorsalis, Giinth. Cat. vi. p. 222 (1866) ; Steiiid. 

 Sitzb. Ak. Wien, Ixi. i. 1870, p. 554, pi. iv. fig. 2. 

 Hyperopisn^ occidentalism Giinth. t. c. p. 223. 



Depth of body 3| to 5 times in total length, length of head 5^ 

 to 5|. Head a little longer than deep, -with strongly curved upper 

 profile ; snout |- to | as long as postorbital part of head ; eye 

 moderate, its diameter about h length of snout ; u"idth of mouth 

 ? or \ leugth of head. Dorsal 12-15, about 3 times as far from 

 the head as from the caudal. Anal 58-65, originating at equal 

 distance from the end of the snout and the root of the caudal, or 

 a httle nearer the latter. Pectoral obtusely pointed, | to | length 

 of head, ventral 5 to f. Caudal scaly, with obtuselj" pointed lobes. 

 Caudal peduncle twice as long as deep, nearly 5 length of head. 

 1 05-120 scales in the lateral line, ^^ in a transverse series on 

 the body,^ ^^ in a transverse series between dorsal and anal, 

 20-22 round caudal peduncle. Plumbeous above, silvery beneath. 



Total length 460 millim. 



Nile and Senegal. 



10, Gentomybus. 



Genyomi/rus, Bouleng. Ann. Mus. Congo, Zool. i. 1898, p. 17. 



Teeth very small, slender, conical, disposed irregularly in several 

 rows in eacli jaw, forming a villiform band ; conical teeth on the 

 parasphenoid and on the tongue; mouth terminal. Body short ; 

 ventrals nearer pectorals than anal. Dorsal and anal nearly 

 equally developed. Yertebrge 49 (13 + 7 + 29). 



1. Genyomyrus donnyi. 



Genyomyrus donnyi, Boulenger, 1. c. pi. ix. 



Depth of body 85 to 4 times in total length, length of head 4 

 to 4g. Head 1| as long as deep, upper profile straight or slightly 

 concave ; snout narrowed, produced, its length 2^ to 3 times its 

 least depth ; mouth terminal ; chin with a tapering dermal appen- 

 dage or barbel, nearly as long as the snout, and pointing forwards ; 

 eye moderate, in the middle of the head, 3i times in length of 

 snout, 2 in interorbital width. Dorsal 31-34, originating slightly 

 behind origin of anal (over 2nd or 4th ray), its length Ig to 1| in 

 its distance from head. Anal 36-38, equally distant from extremity 

 of ventral and base of caudal. Pectoral obtusely pointed, | length 

 of head, a little over twice length of ventral, and extending beyond 

 base ot latter. Caudal scaled, with rounded lobes. Caudal 

 peduncle 3 times as long as deep, g to f length of head. 79-82 

 scales in the lateral line, ]~^ in a transverse series on the body, jg^ 

 in a transverse series between dorsal and anal, 12 round caudal 

 peduncle. Pale brownish above. 



Total length 450 millim. 



Upper Congo. 



