424 Mr. G. A,. Boulcno-er on 



I. Slender mandibular teetli 35 or more ; pos- 

 terior villiform mandibular teeth present. 



A. About GO slender mandibular teeth ; 



maxillary barbel reaching extremity of 



pectoral S. Afro- Fischer i, Hilc 



B. 85-45 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 shield S. angelica, Schilth, 



Humeral process extending beyond occipito- 



nuchal shield S. omias, Gthr. 



n. Slender mandibular teeth not more than 25. 



A. Posterior villiform mandibular teeth 



present ; 16-25 slender mandibular 

 teeth ; maxillary barbel reaching middle 

 of pectoral spine »S'. schall, Bl. Sclm. 



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 



spine S. notatiis, 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 pectoral S. Vaillanti, Blgr.* 



Ci'tharinus congicus. 



Deptli of body twice in total lengtli, length of head 3^ 

 times. Snout very short and broad, a little shorter than 

 diameter of eye, which is 3| 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 J^ length of head. Base of 

 adipose fin f base of dorsal. Pectoral | length of head, 

 reaching base of ventral. Ventral equally long, reaching 



* S. labeo, Vaill., nee Gthr. — Giinther's S. laheo 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 



