270 CHKOMIDES, 



spot on the operculum ; au ovate black spot behind the last dorsal 

 spine. 



Salt Lake and ditches of Tuggurt (Eastern Sahara). Ashantee. 



a-b. Tuggurt. Presented by the Eev. H. B. Tristram. — Types of 



the species. 

 c. Ashantee. 



I have nothing to add to the detailed description given in the 

 ' Proceedings of the Zoological Society,' except that I have found a 

 third specimen in the Collection of the British Museum, said to be 

 from Ashantee. This specimen is eight inches long, and has seven- 

 teen dorsal spines ; the caudal fin is more deeply emarginate, and 

 the soft dorsal and anal are much prolonged, the former nearly ex- 

 tending to the end of the caudal, whilst the outer ventral ray reaches 

 to the middle of the anal. 



The genus Haligenes was separated from Cliromis on account of 

 the indistinctness of the inner series of teeth. It is evident from the 

 large specimen, however, that the interior teeth form rather a band 

 than a series, differing from that in Ckromis only by its being more 

 remote from the front series. 



5. Cliromis poly centra. 



Tilapia polycentra, Dumer. Ann. Mus. x. p. 254. 

 D.^. A.|. 



8 7 



Scales below the eye in three series ; the height of the body is 

 two-fifths of the total length (mthout caudal) ; the width of the 

 interorbital space equals the diameter of the eye *. Scales minutely 

 dotted with black ; the soft portion of the dorsal with light dots, and 

 Avith a black spot at the base. (Dttm.) 



Gorea. 



6. Chromis nigripinnis. 



Tilapia nigripinnis, Guich. in Ann. Mus. x. p. 254. pi. 22. fig. 2. 

 D. 15. A. A 



10 9 



Scales on the cheek in two series ; the height of the body is two- 

 fifths of the total length (without caudal). Uniform brownish ; fins 

 blackish, immaculate. (Bum.) 



Gaboon. 



7. Chromis heudelotii. 

 Tilapia heudelotii, Dumer. Ami. Mus. x. p. 254. 



U. -. A. y. 



Scales on the cheek in three series ; the height of the body is a 

 little less than one-half of the total length (without caudal). Brown- 

 ish ; the soft dorsal with oblique series of dark spots. (Diim.) 



Senegal. 



* In a specimen 0'"'080 long (without caudal). 



