1080 MR. G. A. BOULENGER ON [DeC. 10, 



of pectoral ; outei' mandibular barbel about 1 1 length of inner, 

 which measures f to | length of head. 13 to 15 gill-rakers on 

 first arch. Clavicles not exposed. Dorsal 70-72, its distance 

 from occipital process |- or | length of head, its distance from 

 caudal greater than diameter of eye. Anal 50-58, not reaching 

 caudal. Pectoral about ^ length of head, the spine feeble, not 

 serrated, about k the length of the fin. Yenti-als much nearer 

 end of snout than caudal. Caudal | length of head. Uniform 

 blackish brown. 



Total length 140 millim. 



Lake Tanganyika ; Upper Ubanghi. 



16. Clarias breviceps. 



Boulenger, Ann. Mus. Congo, Zool. i. 1900, p. 135, pi. xlviii. 

 fig. 6, and Poiss. Bass. Congo, p. 258, pi. xiii. fig. 1 (1901). 



Depth of body 6 to 8 times in total length, length of head 4| 

 to 5 times. Head 1-1- as long as broad, smooth ; occipital process 

 angular ; fontanelles small, the frontal sole-shaped and nearly 

 i length of head, the occipital oval and partly on the occipital 

 process ; eye very small, its diameter 3 times in length of snout, 

 6 times in interorbital width ; width of mouth equal to inter- 

 orbital width, i length of head; vomerine teeth conical, forming 

 a crescentic band which is as broad as the preemaxillary band ; 

 nasal barbel |- length of head ; maxillary barbel as long as or a 

 little longer than head, extending to extremity of pectoral ; outer 

 mandibular barbel about 1| length of inner, which measures 

 -3- length of head. 20 gill-rakers on first arch. Clavicles not 

 exposed. Dorsal 58-60, its distance from the occipital process 

 i length of head, its distance from the caudal fin greater than the 

 diameter of the eye. Anal 40-42, not reaching caudal. Pectoral 

 about i length of head, the spine not serrated, about | the length 

 of the fin. Ventrals much nearer end of snout than caudal. 

 Caudal ^ length of head. Uniform blackish brown above, 

 brownish white beneath. 



Total length 190 millim. 



Marshes of Siala-Xtoto, Mayombe. 



17. Clarias walkeri. 



Clarias walkeri Giinther, Ann. & Mag. N. H. (6) xvii. 1896, 

 p. 274, pi. xiv. fig. B. 



Depth of body 6 to 8 times in total length, length of head 

 4 to 4^ times. Head 1^ to Ig as long as broad, smooth above, or 

 very finely granulate behind ; occipital process angular ; frontal 

 fontanelle small, sole-shaped ; occipital fontanelle smaller, in 

 advance of or slightly encroaching upon occipital process ; eye 

 very small, its diameter 3 to 4 times in length of snout, 6 to 8 

 times in interorbital width, which nearly equals width of mouth 

 and is contained twice in length of head ; band of prsemaxillary 

 teeth 4 to 5 times as long as broad ; vomerine teeth conical, 



