334 DR. A. GtJNTHER ON [^Sfov. 18, 



of the orbit. The depth of the body is contained 2g times in the 

 total length (without caudal), the length of the head 2g or 2| 

 times. Eye one fourth of the length of the head, and rather 

 more than two thirds of that of the snout and of the width of the 

 interorbital space ; it is therefore a little nearer to the end of the 

 snout than to the end of the opercle. Interorbital space trans- 

 versely somewhat convex ; upper profile of the head nearly 

 straight. Pectoral fin as long as the head, extending to or 

 beyond the origin of the anal fin. Caudal fin truncated, scaly at 

 the base. Gill-rakers of the outer branchial arch from 24 to 26 

 on the whole arch, or from 19-22 on its lower portion \ Body 

 with well-marked black cross-baiids, eight or nine in number in 

 young individuals, alternately deepei- in colour and broader in 

 width, the foremost (if distinct) being above the root of the 

 pectoral fin, the second opposite to the fifth or sixth dorsal spine. 

 In mature individuals the narrower cross-bands disappear, only 

 five remaining, the last being across the root of the caudal. A 

 large black opercular spot ; sometimes a rounded blackish spot 

 behind the last dorsal spine. 



Total length 143 millim. 



,, „ without caudal ... 112 „ 

 Length of eighth dorsal spine .. . 15 ,, 



Several examples from Lake Busum-chi. 



Olarias kingsley^, sp. n. 



D. 79-87, A. 68. P. 1/9. 



Vomerine teeth villiform, forming a horseshoe-like band, 

 narrowed in the middle, its broadest part being as broad as the 

 intermaxillary band ; each half of the latter is not quite twice as 

 wide as it is broad, and laterally scarcely extends as far outwards 

 as the vomerine band. Head covered above with thick skin, two 

 elevenths of the total length (without caudal), or nearly twice the 

 distance from the origin of the dorsal fin. The width of the 

 interorbital space is nearly one half of the length of the head. 

 Barbels moderately long ; the nasal nearly reaching to the gill- 

 opening, the maxillary nearly to the origin of the dorsal fin, 

 which is somewhat behind the end of the pectoral. Anal fin not 

 low. No free space separating the caudal from the other vertical 

 fins. Coloration uniform. 



Total length 280 millim. 



One specimen from Odumasi, another from Infoan on the 

 R. Offim. 



Heterobranchus isopterus Blkr. 



Two specimens from Nyankoma and Infoan. 



1 As the branchial arch is in many of the species a segment of a more or less 

 perfect circle, it is difficult to fix the boundary between its " lower," posterior or 

 upper portion, and therefore it appears to be safer to count the gill-rakers of the 

 whole arch, and not of a portion alone, 



