450 SILURID^. 



globular swelling; eye supero-lateral, 10 times in length of head, 

 4 times in interorbital width; lips strongly developed; chin swollen ; 

 pracmaxillary teeth forming a short and broad band ; movable mandi- 

 bular teeth minute, reduced to a few. Maxillary barbel not margined, 

 f length of head, reaching base of pectoral spine ; mandibular 

 barbels with long slender branches. Gill-opening not extending 

 down\va.rds beyond root of pectoral spine. Occipito-nuchal shield 

 granulate like the occiput, convex, 1| times as long as broad, with 

 obtuse posterior processes. Humeral process longer than broad, rugose, 

 obtusely pointed, not extending so far back as occipito-nuchal shield. 

 Dorsal I 7 ; spine not quite § length of head, striated, feebly granulate 

 iu front at the base, very feebly serrated behind. Adipose dorsal 

 7 times as long as deep, nearly twice as long as its distance from rayed 

 dorsal. Anal III 9, pointed in front. Pectoral spine as long as dorsal, 

 not serrated. Ventral not reaching anal. Caudal deeply notched. 

 Caudal peduncle a little longer than deep. Brownish, with numerous 

 round dark'^r soots. 



'J'otal length 7'20 millim. 



Niger. 



1. Typo, stuffed. Niger. Mr. J. T. DaKon {C). 



40. SYNODONTIS VATLLANTf. 

 Syiiodo)itis lah-'o. j);irr., Vaill. X. Arch. ]\Ius. (o) viii. I.SIK!, ]). 112, \A. xii. 



S//7io(Ioiifi.'i vaUlaid'}, Boiilenor. Ann. & M'^ig. N. H. (<)) xx. 1(5D7, [). 424, and Poiss. 

 Bass, ('ongo, p. ;U!) (l'.H)lj. 



Depth of body i\ times in total length, length of head o| times. 

 Head 1^ times as long as broad, strongly rugose from between the eyes ; 

 snout 1-j iimes postocular part of head, terminating in a spatulate 

 expansion ; eye supero-lateral, '&\ times in length of head, 3j times in 

 interorbital width ; lips much developed; praemaxillary teeth in several 

 series ; movable niandibuhir teeth not quite ^ diameter of eye, 8 or 9 in 

 number. Maxillary barbel not margined, \ length of head ; outer 

 mandibular barbel as long as maxillary, with short simple branches, 

 inner a little sliortcr and with bifid branches. Gill-opening not 

 extending downwards beyond root of pectoral spine. Occipito-nuchal 

 shield rugose like the occiput, feebly tectiforin, \^ times as long as 



