little-known African Silurid Fishes. 525 



pointed humeral process. D, I (i ; spine striated, § len;^th of 

 liead. Adipose fin 3 times as long as deep, ^ its distance 

 fronj rayed dorsal. A. 11 (2 rays rudimentary). Pectoral 

 with a strong striated spine bearing 12 retrorse teeth on its 

 inner border, its lengtli | that of head. Ventral nearly 

 reaching origin of anal. Caudal peduncle 1^ as long as 

 deep *. 



Total length 90 millim. 



The single specimen, preserved in the Paris Museum, is 

 from the falls of Douine, Upper Ogowe. 



4. MOCHOCUS. 



Mochokus, .loannis, Mag. Zool. 183% Poiss. ; Giinth. Cat. Fish, v 



p. 217(1864). 

 Rhiiioglanis, Giiuth. t. c. p. 21(1 



Body moderately elongate, slightly compressed. Anterior 

 dorsal ending over the ventrals, formed of a strong spine and 

 7 or 8 branched rays; a second dor.sal, formed of soft rays, 

 above the short anal ; pectoral with a strong spine ; ventral 

 with 7 rays. A cephalo-nuchal bony shield. Mouth sub- 

 inferior, without labial folds ; small corneal teeth in both 

 jaws; a maxillary and two mandibular barbels on each side; 

 nostrils rather remote from each other, both with a valve, the 

 posterior very large ; eyes moderate, without free border. 

 Gill-clefts short, confined to the sides. Air-bladder large, 

 free. 



1. Mochocus niloticus. 



Mochokus niloticus, Joanni.s, /. c. pi. viii. 



Rhinoqlanis ti/pus, Giinth. /. c. p. 216, fig., and in Petherick'fl Trav. ii. 



p. 2;i7 (16(59). 

 Rhinoglanis Vannutellii, Vinciguena, Ann. Mu.'». Genova, (2) xix. 1898, 



p. 2.54. 



Depth of body 5| to 5f times in total length, length of 

 head 4 to -4^. Head depressed, as long as broad, rugose 

 above; a large frontal fontanelle ; eye directed upwards, 3 to 

 3^ times in length of head, not much narrower than inter- 

 orbital width ; barbels long and slender, the maxillary reach- 

 ing end of pectoral spine or beyond. Anterior dorsal I 7-S ; 

 spine nearly as long as head, with ascending serra? on anterior 

 border; second dorsal 10-15, al)out as long as its distance 

 from tlie first. Anal 9-10. Pectoral spine a little longer 



* The caudal fin is injured in tlie typi^ specimen ; it was probably 

 notched or i'ori«Hl, not truncate, as figured by Sauvage. 



Ann. <&: May. xV. llmt. k^er. 7. Vol. vi. 35 



