SYNODONTIS. 425 



head, slightly curved, smooth in front, feebly serrated behind. Adipose 

 dorsal 3J times as long as deep, as long as its distance from rayed 

 dorsal. Anal IV 8, rounded. Pectoral spine as long as dorsal, rather 

 feebly serrated on outer border, strongly on inner. Ventral rounded, 

 not reaching anal. Caudal deeply notched. Cauda] peduncle a little 

 longer than deep. Dark brown above, lighter beneath ; back, sides, 

 and fins closely dotted with black. 



Total length 150 millim. 



Lake Ngami district, Bechuanaland. 

 1. Type. Okovango R. R. B. Woosnam, Esq. (C). 



20. SYNODONTIS MARMORATUS. 

 Lonnb. Ofvers. Vet. Ak. Forh. Stockholm, 1895, p. 186. 



Length of head 3j times in total length. Movable mandibular teeth 

 half diameter of eye, 14 to 18 in number. Maxillary barbel longer than 

 head, reaching middle of humeral process, not margined ; mandibular 

 barbels with short and broad branches. Gill-opening not extending 

 downwards beyond root of pectoral spine. Occipito-nuchal shield 

 longer than broad. Humeral process more than twice as long as broad. 

 Dorsal I 7 ; spine about half length of head, smooth in front, serrated 

 behind. Adipose dorsal as long as or shorter than its distance from 

 rayed dorsal. Anal 11-12. Pectoral spine shorter than head, strongly 

 serrated on both sides. Ventral not reaching anal. Caudal deeply 

 forked. Blackish brown, marbled with white ; fins white, marbled with 

 black. 



Total length 52 millim. 



Bonge, Cameroon. — Types in Stockholm Museum. 



21. SYNODONTIS AFRO-FISCHERI. 



Hilgend. Sitzb. Ges. naturf. Fr. Berl. 1888, p. 77 ; Pfeff. Thierw. O.-Afr., 

 Fische, p. 37 (1896) ; Bouleng. Proc. Zool. Soc. 1901, ii. p. 161, and Fish. 

 Nile, p. 364, pi. lxvii. fig. 2 (1907). 



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

 times. Head 1^ to 1^ times as long as broad, granulate above, the 

 granulate area usually extending on the snout to halfway between eye 

 and nostrils ; snout rounded, as long as or slightly shorter than post- 

 ocular part of head ; eye supero-lateral, 4 to 5 times in length of head, 

 If to 2§ times in interorbital width ; lips moderately developed ; prue- 



