320 SILURIM. 



equals interorbital width ; mouth inferior, its width 3^ times in length 

 of head ; prsemaxillary band of teeth straight, 3 times as long as broad ; 

 two small, widely separated groups of teeth on the vomer ; nasal barbel 

 § diameter of eye ; maxillary barbel f length of head ; outer mandibular 

 barbel f length of head, inner \. Gill-rakers moderate, 14 on lower 

 part of anterior arch. Dorsal I 6, 1^ times as distant from root of 

 caudal as from end of snout ; spine about \ length of head, rugose in 

 front, strongly serrated behind ; first soft ray longest, f length of head. 

 Base of adipose dorsal a little shorter than that of rayed dorsal, from 

 which it is separated by a space equal to 2\ times its base. Anal 14, 

 9 rays branched. Pectoral about § length of head ; spine feebly 

 granulate on outer border, strongly serrated on inner. Caudal deeply 

 forked, with pointed lobes, upper the longer, more than 3 times as long 

 as middle rays. Caudal peduncle twice as long as deep. Brown above, 

 silvery white below. 



Total length 205 millim. 



Golungo Alto, Angola. 

 1. Type. Golungo Alto. Dr. Welvvitsch (P.). 



4. CHRYSICHTHYS FURCATUS. 

 Gunth. Cat. Fish. v. p. 430 (1864) ; Steind. Sitzb. Ak. Wieo, lxi. i. 1870, p. 992, 



pi. viii. ; Bouleng. Poiss. Bass. Congo, p. 280 (1901). 

 Chrysichthys camaronensis, Gunth. Proc. Zool. Soc. 1899, p. 729, pi. xliv. 



Depth of body 4f to 6 times in total length, length of head 3^ to 3f 

 times. Head moderately depressed, 1-^ to 1^- times as long as broad, 

 smooth or feebly rugose above ; occipital process narrow, extending to 

 the small interneural shield ; snout rounded, broader than long, once 

 (young) to 3 times as long as eye, which is 4 (young) to 6-j titr.es in 

 length of head and once to twice in interorbital width ; mouth inferior, 

 its width 2\ to 3 times in length of head ; prsemaxillary band of teetli 

 nearly straight, 3 to 4 times as long as broad ; vomero-pterygoid teeth 

 forming a long band interrupted in the middle, its width equal to or a 

 little less than that of the prpemaxillary band in the adult; nasal barbel 

 •§ to once diameter of eye ; maxillary barbel \ to £ length of head ; outer 

 mandibular barbel l-£ times as long as inner, f to ■£ length of head. 

 Gill-rakers rather long, 15 to 20 on lower part of anterior arch. 

 Dorsal I 6, ~[\ to 1-^ times as distant from root of caudal as from end of 

 snout; spine f to | length of head, smooth in front, very feebly serrated 



