little-known African Silurid Fishes. 523 



rather close together, the posterior with a valve; eyes with 

 free border. Gill-clefts short, confined to the sides. Air- 

 bladder small, partially enclosed on each side between the 

 enlarged processes of the anterior vertebrae. 



Distinguished from Chihglanis by the angularly bent, 

 truncate or bicuspid mandibular teeth, which form a broad 

 band ; from Atopochilus by the pointed prajmaxillary teeth 

 so different from those on the mandible. 



Two species. 



1. Euchilichthys Ouentheri. 



Atopochilus Guentheri, Schiltliuis, Tijdschr. Nederl. Dierk, Ver. (2) 

 iii. 1891, p. 86, pi. vi. fig. 2. 



Depth of body § its greatest width, 7 times in total length. 

 Head large, much depressed, covered with soft skin, a little 

 longer than broad, its length 3^ times in total length ; snout 

 broadly rounded, nearly twice as long as postocular part of 

 head ; nostrils nearer end of snout than eye, the diameter of 

 which is 5 times in interocular width ; buccal cleft straight, 

 nearly half length of head ; lateral barbel £ length of head, 

 posterior barbels about half diameter of eye. D. I 6, origi- 

 nating immediately behind pectorals; spine strong, covered 

 with skin, measuring £ length of head. Adipose fin very 

 short. A. 10 (3 rays rudimentary). Pectoral spine ^ length 

 of head, its inner border with strong retrorse spines. Ven- 

 trals not reaching anal. Caudal forked. Caudal peduncle 

 H as long as deep. Skin villose. Dark brown, with small 

 round black spots on the anterior parts. 



Total length 190 millim. 



The single known specimen, from the Stanley Pool, Congo, 

 is now in the British Museum. 



2. Euchilichthys Dybowskii. 



Chiloglanis Dybowskii, Vaillant, Bull. Soc. Philom. 1892, no. 16, p. 2. 



Body a little deeper than broad, its depth 4^ times in total 

 length. Head large, moderately depressed, covered with a 

 very thin skin, not quite 1^ as long as broad, its length 2| 

 times in total length ; snout rounded, nearly twice as long as 

 postocular part of head ; nostrils nearer end of snout than 

 eye, the diameter of which is 5 to 5£ times in length of head, 

 twice in interocular width ; buccal cleft straight, § length of 

 head ; lateral barbel nearly ^ length of head, posterior shorter 

 still. D. I 6 ; spine strong and smooth, § length of head. 



