Fishes from the Upper Congo. 311 



caudal, on which it is produced in three branches. Uniform 

 pale brownish ; dorsal membrane checkered with brown and 

 white spots. 



Total length 107 millim. 



A single specimen. 



Mastacembelus congicus, sp. n. 



Depth of bodj 9 times in total length, length of head 6 

 times. Snout thrice as long as diameter of eye, ending in a 

 dermal appendage which is twice as long as the eje ; cleft of 

 mouth extending hardlj to below nostril; two strong spines 

 at angle of praiopercle. Vertical fins united with the rounded 

 caudal. Dorsal XXVII 45, its distance from the head nearly 

 equal to the length of the latter. Anal I 45. Pectoral ^ 

 length of head. 25 scales between origin of soft dorsal and 

 lateral line. Brown, marbled with darker, with a lateral 

 series of black blotches ; soft dorsal with oblique dark and 

 light lines ; anal dark brown, with a white edge and a series 

 of 11 large round white spots at the base. 



Total length 250 millim. 



A single specimen. 



The four species hitherto recorded from the Congo differ 

 abundantly in the number of dorsal and anal rays : — 



M. cryptacanthus, Gthr D. XXIV 100, A. II 100 



ilf . J/arc/uY, Sauv D. XXIII 75, A. II 76 



M. niger, Sauv D. XXVII 82, A. II 65 



M. marmoratus, Perugia D. XXX 85, A. II 70 



Clarias Dollot, sp. n. 



Vomerine band of villiform teeth as broad as the prse- 

 maxillary band. Head smooth, finely granulate behind, 

 about once and a half as long as broad, 3^ to 4 times in total 

 length ; occipital process angular ; diameter of eye 3 times 

 in length of snout, 5 or 6 times in interorbital width ; nasal 

 barbels as long as the head, maxillary once and a half. 

 Dorsal 70-75. Anal 55-60. Caudal free. Uniform dark 

 brown. The largest specimen is a pied albino, yellowish 

 white spotted with dark brown. 



Total length 250 millim. 



Three specimens. 



Allied to C. macromT/stax, Gthr., but vomerine teeth 

 forming a narrower band. 



Named in honour of my distinguished colleague and friend 

 M. DoUo, ot" the Brussels Museum. 



22* 



