SYNODONTIS. 441 



marginal membrane, 1£ to 1^ times length of head, reaching between 

 basal and distal third of pectoral spine ; outer mandibular barbel about 

 twice as long as inner, former with moderately long, mostly bifid 

 branches, latter with shorter branches with numerous ramifications. 

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

 Occipito-nuchal shield feebly rugose like the occiput, simply convex or 

 obtusely tectiform, 1| to 1^- times as long as broad, posterior processes 

 pointed or obtuse. Humeral process much longer than broad, granulate 

 above, striated below, acutely pointed, extending as far back or a little 

 farther back than occipito-nuchal process. Dorsal I 7 ; spine f to once 

 length of head, more or less curved, striated, smooth in front, strongly 

 serrated behind. Adipose dorsal 3 to 4 times as long as deep, 2 to 3 

 times as long as its distance from rayed dorsal. Anal IV 7-8, obtusely 

 pointed in front. Pectoral spine as long as or a little longer than head, 

 strongly serrated on both sides. Ventral reaching or nearly reaching 

 anal. Caudal deeply notched. Caudal peduncle as long as deep. 

 Brown to blackish above and beneath, with small round or oval yellow 

 spots disposed rather far apart and with great regularity ; rayed fins 

 yellow, barred with black, the black bars usually wider than the yellow 

 interspaces ; the yellow spots and the black bars fewer in the young 

 than in the adult. 

 Total length 18-5 millim. 

 Congo. 



1. Type. Kinshassa, Stanley Pool. M. A. Greshoff (C.) ; 



Utrecht University (E.). 

 M. P. Delhez (0.). 

 Capt. Wilverth (C.). 

 Rev. a. Grenfell (P.). 

 Rev. J. H. Weeks (P.). 

 M. P. Delhez (C). 

 Brussels University. 

 Capt. Royaux (C). 



33. SYNOD ONUS OOURTETI. 



Pellegr. Bull. Mus. Paris, 1906, p. 473, and in Chevalier, Afr. C. Franc, p. 419, 

 fig. (1907). 



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

 Snout subacuminate, twice as long as postocular part of head ; eye 

 supero-lateral, 5^- times in length of head, 1J times in interorbital 



2. Ad. 





Stanley Pool. 



3-4. Ad. 



& hgr. 



Leopoldville. 



5. Ad. 





Bolobo, Upp. Congo. 



6-7. Ad. 





Monsembc, „ 



8. Yg. 





Kutu, L. Leopold II. 



9. Ad. 





Upper Congo. 



0. Yg. 





Banzyville, Ubanghi. 



