244 



CYPEINIDJE. 



over rocks and gravel. The only other fish that was captured in its waters is 

 Clarias carsonii. 



Barbus portali is nearly related to B. zanzibaricus, Peters, but differs in the much 

 longer barbels. B. carj)io has a deeper body, fewer scales, and shorter barbels. 



24. BARBUS CARPIO. 

 (Plate XLV. fig. 3.) 



Pfeffer, Thierw. Ost-Afr., Fische, p. 57 (1896). 



Depth of body a little greater than the length of the head, three and one-third to three 

 and three-fourths times in the total length. Snout rounded, slightly projecting beyond 

 the mouth, three and a half times in the length of the head ; diameter of eye slightly less 

 than length of snout, four and one-fourth to five times in the length of the head, 

 interorbital width twice and a half to three times ; lips rather strongly developed ; 

 barbels two on each side, the anterior once and one-fourth, the posterior once and 

 a half the diameter of the eye. Dorsal fin with IV 7 rays, last simple ray strong, 

 bony, strongly serrated behind, about half the length of the head ; free edge of the 

 fin nearly straight. Anal fin with III 5 rays. Pectoral fin two-thirds the length 

 of the head, not reaching the base of the ventral; latter below anterior rays of dorsal. 

 Caudal fin deeply forked. Caudal peduncle once and one-third to once and a half 

 as long as deep. Scales with fan-shaped striation, 28 g, 3 between lateral line and 

 ventral, 12 round caudal peduncle. 



Brown, darker on the back, silvery on the belly ; a blackish streak on the side of 

 the caudal region of the body, sometimes extending forwards, interrupted, to the 

 upper extremity of the gill-cover ; dorsal and caudal fins grey or blackish. 



Measurements (in millimetres). 



Total length . 67 



„ „ (without caudal) 60 



Greatest depth of body 18 



Length of head 17 



Width of head 8 



Length of snout 5 



Diameter of eye 4 



Interorbital width 5i 



Width of mouth 4 



Length of pectoral Hi 



This species was discovered by Dr. Stuhlmann at Undussuma Bay, at the southern 

 end of Lake Albert, and described by Prof. Pfeffer, to whom I am indebted for the 

 loan of one of the type specimens. 



