364 silubid^. 



process. Skin smooth, without villosities. Dorsal fin with I 6 or 7 rays; spine 

 strong, straight, three-fourths the length of the head, smooth in front, with 8 small 

 seme behind. Adipose dorsal fin four or five times as long as deep, once and two- 

 thirds to twice its distance from the rayed dorsal. Anal fin with 12 rays, 8 of which are 

 branched. Pectoral spine a little shorter than the head, not reaching the ventral fin, 

 feebly serrated on the outer side, with 20 strong serree on the inner side. Ventral fin 

 rounded, not reaching the anal. Caudal fin deeply forked, the upper lobe the longer. 

 Caudal peduncle as long as deep or slightly longer. 



Brown above, white beneath, the brown parts with rather large round darker spots, 

 which may be very indistinct ; iris pure white. 



Total length 250 millimetres. 



Discovered in Lake Victoria by Mr. E. Degen. One specimen is from Entebbe 

 (1.10.05), the other from Buganga (15.11.05). 



5. SYNODONTIS AFRO-FISCHERI. 

 (Plate LXVII. fig. 2.) 



Hilgendorf, Sitzb. Ges. naturf. Fr. Berl. 1888, p. 77 ; Pfeffer, Thierw. O.-Afr* Fisclie, p. 37 (1896) ; 

 Boulenger, Proc. Zool. Soc. 1901, ii. p. 161. 



Body moderately compressed, its depth three and a half to four and a half times 

 in the total length, the length of the head three and a half to four times. Head once 

 and one-fifth to once and one-third as long as broad, as broad as or a little broader 

 than deep, granulate above, the granulate area usually extending on the snout 

 to halfway between the eye and the nostrils ; snout rounded, as long as or slightly 

 shorter than the postocular part of the head; frontal fontanelle narrow; eye 

 superolateral, its diameter four to five times in the length of the head, once and 

 three-fourths to twice and one-third in the width of the interorbital region, which is 

 slightly convex ; occiput simply convex. Mouth with moderately developed lips ; 

 praemaxillary teeth forming a short and broad band ; movable mandibular teeth not 

 half the diameter of the eye, 45 to 54 in number. Maxillary barbel without or with 

 only a slight trace of a marginal membrane, once to once and three-fifths the length 

 of the head, reaching between the anterior and the posterior third of the pectoral 

 spine; mandibular barbels inserted on a straight transverse line, the outer once and 

 two-thirds to twice as long as the inner, the former with slender branches, the latter 

 with shorter but ramified branches. Gill-opening not extending downwards beyond 

 the root of the pectoral fin. Occipito-nuchal shield rugose and convex like the 

 occiput, once and a half to once and two-thirds as long as broad, the posterior 



