RTNODONTIS. 445 



not extending downwards beyond root of pectoral spine. Occipito- 

 nuchal shield rugose like the occiput, simply convex, 1^ to 1^ times as 

 long as broad, posterior processes more or less pointed. Humeral 

 process granulate and striated, not keeled, 1^ to 1^ times as long as 

 broad, pointed, not extending quite so far back as occipito-nuchal 

 process. Dorsal I 7 ; spine |- to f as long as head, feebly curved, 

 striated, smooth in front, serrated behind. Adipose dorsal 3 to 4 times 

 as long as deep, 1| to 2-^ times as long as its distance from rayed dorsal. 

 Anal IV 7, obtusely pointed in front. Pectoral spine a little shorter 

 than head, strongly serrated on both sides. Ventral not reaching anal. 

 Caudal fin deeply notched, crescentic, upper lobe the longer and more 

 •or less produced. Caudal peduncle nearly as long as deep. Yellowii«h 

 or pale olive above with large rounded dark spots, white beneath ; rayed 

 fins (except pectoral) yellow, with black spots confluent into transverse 

 bands ; on the caudal, these bands forming crescents inversely to the 

 shape of the fin. 



Total length 200 millim. 



Congo, Angola, Lake Mweru. — Types in Congo Museum, Tervueren. 



.1-2. Types. Coquilhatville, Upp. Congo. M. P. Delliez (C). 



3. Yg. Quanza R., Angola. Dr. W. J. Ansorge (C). 



4. Ad., .skin. L. Mweru. Sir A. Sharpe (P.). 



36. SYNODONTIS SOLONI. 



Bouleng. Ann. Mus. Congo, Zool. i. p. 110, pi. xliii. fig. 1 (1899), and Poiss. Bass. 

 Congo, p. 320 (1901). 



Depth of body 5 times in total length, length of head 3f times. 

 Head 1-^ times as long as broad, finely granulate above ; snout obtusely 

 pointed, nearly 1^ times as long as postocnlar part of head ; eye supero- 

 lateral, 6 times in length of head, not quite twice in interorbital width ; 

 lips moderately developed ; prtemaxillary teeth in 3 or 4 irregular trans- 

 verse series ; movable mandibular teeth about ^ diameter of eye, 18 to 

 20 in number. Maxillary barbel with a broad marginal membrane at 

 base, as long as head, not reaching middle of pectoral spine ; mandibular 

 barbels with short ramified branches, outer nearly twice as long as inner. 

 Gill-opening not extending downwards beyond root of pectoral spine. 

 Occipito-nuchal shield rough like the occiput, simply convex, IJ to IJ 

 times as long as broad, with rounded posterior processes. Humeral 

 process granulate and striate, much longer than broad, acutely pointed, 



