PARAPHAGO.— MESOBORUS. 245 



longest ray half length of head. Anal III 10-11. Pectoral shorter 

 than ventral, hardly f length of head. Caudal forked, with obtusely 

 pointed lobes. Caudal peduncle nearly 3 times as long as deep. Scales 

 87-90 -~-, 9 between lateral line and root of ventral. Olive above, 

 whitish beneath ■ a median and two lateral series of black spots, the 

 lower forming vertical bars across the lateral line ; three more or less 

 regular black streaks across the dorsal ; a black spot on the adipose flu ; 

 a black streak on the middle rays, and three oblique ones on each lobe 

 of the caudal. 



Total length 130 millim. 



Upper Congo (Lake Leopold II.). — Types in Congo Museum, 

 Tervueren. 

 1. One of the types. Kutu, L. Leopold II. M. P. Delhez (C ). 



9. MESOBORUS. 

 Pellegr. Bull. Mus. Paris, 1900, p. 178 ; Bouleng. Poiss. Bass. Congo, p. 175 (1901;. 



Snout elongate, pointed; mouth large ; upper jaw movable upwards; 

 maxillary very small, hidden under the prasorbital when the mouth is 

 closed ; prsemaxillary and dentary with two series of teeth, the outer 

 strong, compressed, pointed, the point directed backwards, with or 

 without a secondary cusp, the anterior large, canine-like ; teeth of inner 

 series very small. Greater part of cheek covered by the suborbitals ; 

 nostrils near the eye, close together, separated by a valvular flap ; gill- 

 membranes narrowly united to isthmus. Body elongate, compressed. 

 Scales small, strongly ciliated; lateral line straight, along the middle of 

 the side ; a small scaly process at base of ventral. Dorsal with 18 rays, 

 above the ventrals; anal with 14 rays; adipose dorsal fin small. 



Congo. 



1. MESOBORUS CROCODILUS. 

 Pellegr. 1. c. ; Bouleng. 1. c. 



Depth of body 4 times in total length, length of head 3 times. Head 

 3 times as long as broad ; snout twice as long as eye, which is 4J times 

 in length of head and exceeds interorbital width : mouth extending to 

 below anterior border of eye ; 29 or 30 small teeth on each side and a 

 pair of canines in front of each jaw, the canines of the lower jaw 

 separated by a pair of small teeth ; naked part of cheek half width of 

 suborbital. Gill-rakers short, 17 on lower part of anterior arch. 



