234 
TRAVELS IN CENTRAL AFRICA. 
white membrane ; the outer maiidibulary barbels two-thirds as long 
as those of the maxillse^ provided with filaments. The height of 
the body is rather less than one-fourth of the total length (without 
caudal) ^ the length of the head two-sevenths. Dorsal and pectoral 
spines slightly crenulated along their outer margins; humeral 
process as high as long. The first ray of the dorsal and pectoral 
fins produced. The adipose fin commences at a short distance 
from the dorsal_, its length being contained thrice and a third in 
the "total (without caudal). Caudal fin deeply forked^ both lobes 
being prolonged : the upper is the longer^ one-third^ or more than 
one-third^ of the total length. Coloration uniform : a black baud 
along each caudal lobe ; a blackish spot at the base of the hinder 
half of the dorsal fin. 
This species has been discovered by Mr. Petherick at Khartoum. 
Sy7iodontis macrodon. [Scheilan.) 
D. 1/7. A. 13. P. 1/8. V. 7. 
The gill-opening extends downwards to before the root of the 
pectoral fin; mandibulary teeth very long and slender,, nearly as 
long as the eye. Maxillary barbels about as long as the head,, 
provided with long fringes. Dorsal and pectoral spines serrated 
along both edges ; humeral process not much longer than high. 
Synodo}itis serratus, Kiipp. 
D. 1/7. A. 12-13. P. 1/9. V. 7. 
The gill- opening extends downwards to before the root of the 
