236 
TEAVELS IN CENTEAL AFEICA. 
The humeral proeess is exceedingly long^ extending further back- 
wards than the nuchal cuirass. 
This has been described by Valenciennes from a figure^ but no 
example has since been found. 
Synodontis membranaceus, Geoffr. [Schal baten soda.) 
D. 1/7. A. 12. P. 1/9. V. 7. 
The gill-opening extends downwards nearly to the middle of the 
throat ; mandibulary teeth very short and small,, forming a minute 
patch. Maxillary barbels shorter than the head,, lined with a very 
broad black membrane. Dorsal spine not serrated in front ; humeral 
process as long as high. The adipose fin commences immediately 
behind the dorsal. Belly black. 
Upper Nile. Specimens,, twenty inches long^ have been collected 
by Mr. Petherick. 
Rhinoglanis. 
Body scaleless. Two dorsal fins, both composed of rays, the first 
with a strong spine ; anal rather short. Teeth in both jaws minute ; 
palate edentulous ; mouth transverse, of moderate width, mandibles 
well developed. Barbels six, not compressed. Eyes free, of mode- 
rate size ; anterior and posterior nostrils close together ; the pos- 
terior nostril very large, open. Neck with broad dermal bones. 
