APPENDIX. No. IV. 409 
sides and back very long-ovate and carinated. Found in palm trees at 
Embomma. 
Coluber Smythii, (new species.) Brown-gray beneath whitish, the sides, espe- 
cially anteriorly, with triangular whitish spots, bordered with sooty-black ; 
the scales of the sides and back hexagonal, rather narrower at their extremi- 
ties. This species was found in great plenty near Embomma on the 
ground, The back is very faintly marked with some transverse narrow 
whitish bands, spotted with black. 
FIsHEs. 
About eighty species of this class were taken during the voyage; but as I 
have not yet studied the marine fishes, T can say but little about them. ‘Two 
species of a genus (which appears to be new) allied to Leptocephalus were taken 
off the African coast. Their head is smaller and more pointed than that of 
Leptocephalus ; their bodies are even more compressed, but are marked in 
the same manner by transverse zigzag lines, and their teeth are similar. 
Rudiments only of the dorsal and anal fins exist towards the extremity of their 
bodies, and no pectoral fins can be discovered. 
In the river itself three new species were discovered, namely : 
Sp. 1. Silurus Congensis. With the upper nostrils the angles of the mouth 
and each side of the chin furnished with a filament, the first ray of the dorsal 
and pectoral fins serrated towards the point, which is unconnected with the 
second ray; the second ray very much elongated and attenuated, the 
lacinize of the tale acute. 
Ors. The first ray of the dorsal fin is only serrated towards its point, the 
unconnected apex itself being destitute of teeth. The first ray of the 
pectoral fins, is serrated above the unattached part, and the teeth are con- 
‘tinued downwards to near its middle. It is akin to Silwrus mystus (Geoff: 
Poiss. de Nile.) but may very easily be distinguished from it by the 
characters of the pectoral fins, and by the presence of the filaments on 
the chin. The filaments of the chin and nostrils are nearly of equal 
length; those of the angles of the mouth are very long. 
Sp. 2. Pimelodus Cranchii. Chin on each side nostrils and angles of the mouth 
furnished with a filament, pectoral fins with the first ray shorter than the 
second, very strong and sulcated; behind very strongly serrated, anterior 
3G 
