1899.] rilOM THE GOLD COAST. 717 



{HaplocMliis infra-fa sciatus, Petersins), but also because it has led 

 to a more critical revision o£ the Gaboon species of Chri/sichtJii/s, 

 which are more numerous and more difficult of discrimination than 

 I was formerly inclined to admit. 



The specimens were collected at the following localities : — 



1. On the Eiver Prah, which falls into the sea at Chama, lat. 5°, 

 long. 2° 30' ; a tortuous river with numerous small rapids separated 

 by sluggish pools, its course being chiefly in the Denkera country. 



2. On the River Offim, one of the most considerable affluents of 

 the Prah, and very similar to it : its course is through the Ashantee 

 country. 



3. (3n the River Kotchwah, a tributary of the Emissa, which 

 also falls into the sea a little east of Saltpond. 



4. On the Sweet River or Kakum, a small river falling into the 

 sea between Elmina and Cape Coast Castle. 



Ordinaiy maps give only an indistinct indication of these rivers, 

 and Miss Kingsley informs me that their topography is all the more 

 perplexing, as most of the rivers have two names, one in the Ya, 

 and the other in the Pantee language. 



Cheomis ogowensis. 



Chromis ogoiuensis, Giinth. Ann. & Mag. N. H. 1896, April, 

 p. 271. 



I refer two specimens from the Prah River, two from the 

 Kotchwah R., and three from the Kakum R. to this species. 

 They show only some insignificant differences in the general form of 

 the head. All possess 8 anal rays. The formula of the dorsal fin is 

 i-^- in five specimens, and [f and J-A in two, both these latter 

 specimens coming from the Kakum R. In all the teeth are 

 numerous, viz., from 25 to 29 on each side of the upper jaw. 

 Number of gill-rakers on the outer branchial arch from 13 to 17. 



Hemicheomis tersquamatus, sp. n. (Plate XLII. fig. B.) 



D. If A. f . L. lat. 28. L. transv. 3/10. 



Teeth in a double series, those of the inner being minute and 

 rudimentary. The height of the body is contained 2| times in 

 the total length (without caudal), the length of the head 2| times. 

 Snout with the upper profile straight. Eye a little nearer to the 

 end of the operculum than to that of the snout, and contained 

 1§ times in the length of the latter. Interorbital space barely 

 wider than the orbit. Maxillary not reaching to the vertica 

 from the orbit. Cheek Avith three series of scales. Gill-rakers 

 short and transverse, 11 on the lower branch of the outer 

 arch. Posterior dorsal spines very little longer than the middle 

 ones, the last being two-fifths of the length of the head. Pectoral 

 about as long as ventral, which reaches to the vent. Caudal 

 rounded. Caudal peduncle a little deeper than long. Scales 

 smooth. Body with traces of five broadish dark cross-bands, 

 which are darkest in the middle of the body, where they have the 



