328 Annals of the South African Museum. 



of snout ; posterior nostril close to eye, near its lower border ; eye 

 slightly less than snout, 5 to 5f times in length of head and ^ to 

 } interocular width. Head and snout covered with numerous small 

 tubercles. 



Dorsal 16-17, originating above 4th ray of anal, its length about 

 ^ its distance from head. Anal 22, nearly equidistant from base of 

 ventrals and base of caudal. Pectorals pointed, sub-falcate, a little 

 shorter than head, about twice as long as ventrals and extending 

 beyond root of latter. The caudal lobes in two of the specimens are 

 somewhat pointed, but in the third rounded ; caudal peduncle about 

 3 times as long as deep, about f length of head. Scales in lateral 

 line 53; }-f scales in transverse series across body, \\ in transverse 

 series between dorsal and anal, 16 round caudal peduncle. 



Colour (of preserved specimens), mottled brown. 



Three specimens, 54 mm., 54 mm., 67 mm. in length respectively, 

 from Kafue Eiver, Upper Zambezi (J. Drury). 



MARCUSENIUS CASTELNAUI, Blgr. 



Bouleng., Trans. Zool. Soc., Lond., vol. xviii., part v., p. 402, 



May, 1911. 



FIG. 6. Marcusenius castelnaui. 



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

 Head as long as deep, twice as long as broad ; snout rounded, 

 1 length of head, projecting very slightly beyond mouth ; mouth 

 small, well below level of lower border of eye ; teeth small, notched, 

 7 in upper jaw, 8 in lower; eye rather indistinctly denned, nearly as 

 long as snout, its diameter not J interocular width ; posterior nostril 

 a little lower down than upper, close to eye. 



Dorsal fin 17, originating above 4th ray of anal, its length half its 

 distance from head, upper border slightly convex in front, longest 

 ray f length of head. Anal 23, similar to dorsal but longer, equally 

 distant from base of ventrals and from base of caudal. Pectoral 



