1907,] AFRICAN SILURID FISHES. 1075 



of head ; occipital fontanelle very small, in advance of occipital 

 process ; eye 3;^ times in length of snout, 5| times in interorbital 

 width, which exceeds width of mouth and equals A length of head ; 

 band of prsemaxillary teeth 4 times as long as broad ; vomerine 



Text-fio-. 251. 



Clarias mellandi. 



teeth granular, forming a large semielhptic patch, squarely trun- 

 cate behind, its longitudinal diameter 3 times that of the band of 

 prsemaxillary teeth ; nasal barbel -f length of head ; maxillary 

 barbel f length of head, reaching gill-opening ; outer mandibular 

 barbel | length of head. Gill-rakers long, about 35 on anterior 

 arch. Clavicles striated, distinct under the thin skin. Dorsal 

 65, its distance from occipital process l leng-th of head, its dis- 

 tance from caudal fin I leng-th of head. Anal 55, very narrowly 

 separated from caudal. Pectoral | length of head, its spine 

 serrated on the outer border and | the length of the fin. Yentral 

 slightly nearer end of snout than caudal. Caudal | length of 

 head. Olive-brown above, marbled with darker, whitish beneath ; 

 ^ dark streak on each side of the throat. 



Total length 345 millim. 



Lake Bangwelu. 



Young specimens (85-145 millim. long) recently obtained 

 in Angola, in shallow swamps at Dongwenna, Mossamedes, by 

 Dr. Ansorge, appear to me to be referable to this species. In the 

 smallest, the vomerine band of teeth is crescentic, and only a 

 little broader than the prsemaxillary, whilst in the largest it 

 forms almost a half-disk. 16-20 gill-rakers on anterior arch. 

 Dorsal 70. Anal 60, Distance between dorsal and caudal | to i 

 length of head. 



9. Clarias tsanensis. 



Boulenger, Ann. k Mag. N. H. (7) x. 1902, p. 438, and 

 Fish. Nile, p. 292, pi. li. fig. 2 (1907). 

 Depth of body 6^ to 7| times in total length, length of head 



