274 CHEOMIDES. 



We refer, for the present, the following species to this genus, on 

 account of the alleged absence of scales on the opercles. 



2. Sarotherodon (?) zillii. 



Acerina zillii, Gervais, Acad. Sc. et Lettres Montpellter, 1848, and Ann. 



Sc. Nat. 3 s^r. x. p. 303. 

 Coptodon zillii, Gervais, Bull. Soc. cent. Aqricidt. de nierault, 1853, 



p. 80. pi. 4. figs. 5-7. 

 Glyphisodon zillii, Valenc. Comptcs Rend. xlvi. 1858, p. 713. 



D.|J. A.|. L. lat. 24. 



Five or six branchiostegals. Forty teeth in the upper jaw, thirty- 

 six in the lower. Scales on the check in three or four series. The 

 height of the body is more than the length of the head, and one-third 

 of the total. Dorsal fin low ; caudal slightly emarginate ; pectoral 

 extending on to the vent. The diameter of the eye is one-third of 

 the length of the head. Greenish, with five or six cross-bands ; a 

 black spot on the last dorsal spines and anterior dorsal rays ; oper- 

 culum with a blackish spot. (Vol.) 



Salt-ditches of the Sahara. 



Circumvolutions of the intestines numerous ; two pyloric append- 

 ages. Herbivorous. 



Lahrus desfontainn, Lacep. iv. pp. 54, 160, from the hot-springs of 

 Cafsa (Tunis), is, perhaps, a species closely allied to the preceding. 



4. HEMICHROMIS. . 



Hemichromis, Peters, Monatsher. Berl. Acad, 1857, p. 403. 

 Chromichthys, (Guich.) Dumer. Ann. Mus. x. p. 257. 



Body oblong, covered with cycloid scales of moderate size. Dorsal 

 spines numerous, anal spines three ; base of the soft dorsal naked ; 

 checks and opercles scaly. Mouth protractile. Teeth conical, in 

 one or two series above, in one below. Anterior prominences of the 

 first branchial arch short, compressed, horny, bicuspid. Branchio- 

 stegals five. 



Western parts of tropical Africa. 



1. Hemichromis fasciatus. 



Hemichromis fasciatus, Peters, I. e. 

 Chromichthys elongatus, Diimer. I. c. pi. 22. fig. 3. 



D. ij. A. -. L. lat. 28. L. transv. 3/9. 



The two middle teeth in the upper jaw are the longest. Scales on 

 the cheek in five series. The height of the body is somewhat more than 

 the length of the head, and contained twice and two-thirds in the 

 total (Avithout caudal). Snout conical, longer than the eye. Brown- 

 ish-green, with five or six blackish cross-bands ; each scale below 

 the lateral line mth a dark vertical streak ; a large blackish blotch 



