1907.] AFRICAN SILUEID FISHES. 1093- 



1. Clakiallabes MELAS. 



Clarices melas Boulena'er. Ann. & Mao-. JST. H. (5) xix. 1887, 

 p. 148. 



Clariallabes melas Boulenger, 11. cc, and Proc. Zool. Soc. 1902, 

 i. pi. xxii. fig. 2. 



Depth of body 10 to 11 times in total length, length of head 

 6 times. Head once and | as long as broad, smooth, the bony 

 casque, in the middle, about | width of head ; supraoccipital 

 process acutely pointed ; frontal fontanelle sole-shaped, twice and 

 ^ as long as broad ; occipital fontanelle smaller, oval, pa];'tly on 

 occipital process ; eye very small, its diameter 4 times in length 

 of snout, 7 times in interorbital width, which is 5 length of head 

 and a little less than width of mouth ; band of praemaxillary 

 teeth hardly 4 times as long as broad ; vomerine teeth pointed, 

 forming a crescentic band which is a little narrower than the 

 prsemaxillary band ; nasal barbel f to | length of head ; maxillary 

 barbel nearly as long as head ; inner mandibular barbel | to |- 

 length of head, outer nearly as long as head. Gill-rakers 

 moderately long, 12 to 15 on anterior arch. Clavicles scarcely 

 distinguishable under the skin. Dorsal 105-115, its distance 

 from occipital process k length of head. Anal 88-90. Both 

 dorsal and anal united with caudal, which measures k length of 

 head. Pectoral nearly h length of head, its spine serrated on 

 both edges and about | the length of the fin. Ventral 1| to 2 

 times distant from root of caudal as from end of siiout. Uniform 

 blackish brown. 



Total length 260 millim. 



Lower Congo. 



4. Gymxallabes. 

 Giinther, Ann. k Mag. X. H. (3) xx. 1867, p. 111. 

 A single species. 



1. Gymxallabes typus. 



Giinther, 1. c. pi. ii. fig. A. 



Depth of body 14 to 15 times in total length, length of head 

 7^ to 8^ times. Head about once and j as long as broad, the 

 width of the bony part, in the middle, y to i width of head ; 

 supraoccipital process acutely pointed ; eye very small ; inter- 

 orbital width less than Avidth of mouth, about ^ length of head ; 

 band of pra^maxillary teeth 3 to 3| times as long as broad; 

 vomerine teeth pointed, forming a crescentic band which is 

 narrower than the prasmaxillary band ; a much developed lobe 

 at the angle of the mouth ; nasal barbel f to ■§■ length of head ; 

 maxillary barbel a little longer than head ; inner mandibular 

 barbel | to | length of head, outer a little shorter than head. 

 Gill-rakers moderately long, 10 on anterior arch. Clavicles 

 hidden under the skin. Dorsal 98-110, its distance from occipital 

 process 7- to | length of head. Anal 82-88. Dorsal and anal 

 completely united with caudal, which is | to -| length of head 



