1899.] ^BOM tHE GOLD COASI^ 731 



young specimen agi-ees better with these proportions than with 

 those given by Bleeker. On the other hand, in the figure by 

 which he illustrates his description, the eye seems to have been 

 represented of too small a size. 



HaPLOCHILUS rNTBAFASCIATUS Gthr. 



Several immature specimens from the Kakum Eiver. 



Alestes longipinnis Gthr. 



Is apparently common in the Kotchwah Eiver. 



Petbrsitts occidentalis, sp. n. (Plate XLV., fig. B.) 

 D. 10. A. 21-24. L. lat. 25. L. transv. 4/3. 



The height of the body is contained 3 times, the length of the 

 head 3| times in the total (without caudal) ; eye large, longer than 

 the snout, and contained 2| times in the length of the head ; head, 

 like body, strongly compressed, but the abdomen rounded in fro^ 

 of the ventrals. Dorsal fiu higher than long, its first ray in the 

 middle between the end of the snout and the root of the caudal. 

 Anal of the mature male with the anterior rays somewhat enlarged, 

 forming a projecting lobe. Caudal forked. There are two series 

 of scales between the lateral line and ventral fin ; the lateral line 

 is anteriorly curved downward and runs towards the lower edge 

 of the caudal peduncle, the perforations of the scales becoming 

 indistinct. Silvery, with an indistinct, narrow, bluish band along 

 the middle of the side and tail. Dorsal fin black in its anterior 

 half, with a yellow band across the middle. This ornamental 

 marking is most distinct in adult males, and very obsolete in 

 immature specimens. 



Six specimens, the longest 60 milLim. long, from the Kotchwah 

 Eiver. 



I have referred this fish to Hilgendorf's genus Peter sius (S.B. 

 Ges. ntrf. Pr. Berlin, 1894, p. 172), from the Kingani Eiver in East 

 Africa, although it does not quite agree with Hilgendorf's de- 

 scription of the dentition ; this author also does not mention the 

 partial disappearance of the lateral line on the tail. The teeth in 

 the intermaxillary stand in two series, but the two series are quite 

 separate, and the teeth of the two series are opposite to each other 

 rather than altei-nate. I count sis in the anterior, eight in the 

 posterior, and as many in the mandibular series. The largest are 

 in the posterior series, where they may be seven-pointed, the largest 

 central cusps being laterally compressed. Those of the front series 

 are more simple, but all seem to be tricuspid at least. No maxillary 

 teeth. 



MOBMVEUS LOKGICEPS Gthr. 



Mormyrus longiceps, Giinth. Ann. & Mag. N. H. 1867, xx. 

 p. 116. 



One specimen, from the Kotchwah Eiver. 



