1907.] 



AFRICAN SILURID FISHES. 



1081 



forming a crescentic band which, in the middle, is about as broad 

 as the prsemaxillary band ; nasal barbel ^ to | length of head ; 

 maxillary barbel Ig to 2 times as long as head, reaching extremity 

 of pectoral or base of ventral ; inner mandibular baiijcl a little 

 shorter than nasal, | to -| length of outer. Gill-rakers on first 

 arch widely set^ 12 to 15 in number. Clavicles concealed under 

 the skin. Dorsal 70-80, its distance from occipital process 3 to g 

 length of head, separated from caudal by an interspace at least as 

 great as diameter of eye. Anal 52-60, narrowly separated from 

 caudal. Pectoral 4 to |^ length of head, the spine feebly serrated 

 on both sides, f the length of the fin. Ventrals 1^ to 1-| times 

 as distant from base of caudal as from end of snout. Caudal about 

 i to -i length of head. Dark brown above, whitish beneath ; dorsal 

 and anal with a lighter edge. 



Total length 290 millim. 



South Cameroon to Ogowe. 



18. Clakias loxgior. 



Boulenger, Ann. & Mag. N. H. (7) xx. 1907, p. 51. 



Depth of body 8 to 9 times in total length, length of head 

 5 to 5| times. Head extremely depressed, once and | as long as 

 broad, smooth ; occipital process very short, pointed ; frontal 

 fontanelle knife-shaped, about 3 times as long as broad ; occipital 

 fontanelle smaller, in advance of occipital process ; eye very small, 

 2| times in length of snout, 5 or 5| times in interorbital width, 

 which equals width of mouth and | length of head ; band of 



Text-fig. 253. 



^^) 



6:^^^^ 



Clarias longior. 



prfemaxillary teeth 4 times as long as broad ; vomerine teeth 

 granular, forming a curved band which is as broad as the 

 prfemaxillary band ; nasal barbel | to | length of head, maxillary 

 1^ to I times, outer mandibular once, inner mandibular | to |. 

 GiU-rakers very few, 12 on anterior arch. Clavicles concealed 



