APPENDIX. No. IV. 409 



sides and back very long-ovate and carinated. Found in palna trees at 

 Embomma. 

 Coluber Smythii, (new species.) Brown-gray beneath whitish, the sides, espe- 

 cially anteriorly, with triangular whitish spots, bordered \vith sooty-black ; 

 the scales of the sides and back hexagonal, ratlier narrower at their extremi- 

 ties. This species was found in great plenty near Embomma on the 

 ground. The back is very faintly marked ^vith 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, I can say but little about them. Two 

 species of a genus (which appears to be new) allied to Leptocephalus were taken 

 off the Afi-ican ooast. Their head is smaller and more pointed than that of 

 Leptocephalus ; their bodies are even more compressed, but are marked m 

 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. I. 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 

 lacinia; of the tale acute. 



Obs. 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 pai-t, and the teeth are con- 

 tinued downwards to near its middle. It is akin to Silurus 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 ai-e 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 



