424 Mr. G. A. Boulenger on 
I. Slender mandibular teeth 35 or more; pos- 
terior villiform mandibular teeth present. 
A. About 60 slender mandibular teeth; 
maxillary barbel reaching extremity of 
POcborallten ewer is a «0 cree S. Afro-Fischeri, Hilg. 
B. 35-45 slender mandibular teeth. 
1. Maxillary barbel reaching beyond ex- 
tremity of pectoral spine .......... S. Greshoffi, Schilth. 
2. Maxillary barbel not extending beyond 
middle of pectoral spine. 
Humeral process not extending beyond occipito- 
nuchal shields; caasees oes otinb cet apt oot S. angelica, Schilth. 
Humeral process extending beyond occipito- 
MUCHA SHICIT Zc pitemictscrrep shia Tae owe oe SR S. omias, Gthr. 
II. Slender mandibular teeth not more than 25. 
A. Posterior villiform mandibular teeth 
present ; 16-25 slender mandibular 
teeth ; maxillary barbel reaching middle 
OLMPECLOTAL SPINS hei.» i= lode oie ieee S. schall, Bl. Sehn, 
B. No posterior villiform mandibular teeth. 
1. 15-25 slender mandibular teeth. 
a. Eyes sublateral, well visible from 
above. 
Maxillary barbel reaching caudal fin .......... S. Alberti, Schilth. 
Maxillary barbel reaching middle of pectoral 
SPIChan Rete resets os weietek, cheers moeem te S. notatus, Vaill. 
b. Eyes perfectly lateral, just visible 
from above as well as from below; 
maxillary barbel not reaching be- 
yond base of pectoral .......... S. pleurops, Blgr. 
2. Not more than 10 slender mandibular 
teeth ; maxillary barbel not reaching 
base of pectorals ses . chan face S. Vaillanti, Blgr.* 
Citharinus congicus. 
Depth of body twice in total length, length of head 34 
times. Snout very short and broad, a little shorter than 
diameter of eye, which is 33 times in length of head and 1} 
in interorbital width; free border of opercle forming nearly a 
right angle ; a much-developed membranaceous border to the 
opercle. Dorsal 18, originating a little nearer base of caudal 
than end of snout; fourth ray 14 length of head. Base of 
adipose fin 2 base of dorsal. Pectoral 2 length of head, 
reaching base of ventral. Ventral equally long, reaching 
* i. labeo, Vaill., nec Gthr.—Giinther’s S. /abeo differs in the longer 
maxillary barbel, reaching anterior third of pectoral spine; the shorter 
humeral process, which extends only to below the middle of the occipito- 
nuchal shield; and the longer adipose fin, which equals nearly twice its 
distance from the dorsal. Another difference, in the distance between 
ventral and anal, has been pointed out by Vaillant himself. 
— oun Degée ae tae , 
