Fresh tcahr Fis/i of Ahjeriii. 389 



Gen-ais on the frcsli water Hsh of Algeria*. lie there al- 

 ludes to the discovery i>t" a species of Gasterosteus (made, in 

 fact, by us). This he inia;i^ines, despite of several secondary 

 differences, to be referaltle to the variety connnon in the neigh- 

 bourhood i^i Paris, of u hieli Cuvier has made his species (i . 

 leiurus, and whidi is undoubtedly only a variety of the common 

 Kuropean species d'. wn/nifus. 



We have again carefully examined our numerous specimens, 

 and we are convinced that it bears a much closer resemblance 

 to the Italian species to which we have referreil it. 



Our endeavours to obtain specimens of the Chromida? found 

 in the salt and brackish waters, and even in the artesian wells 

 of the eastern Sahara, have hitherto been without success ; 

 but an examination of the literature of the subject leaves 

 little doubt on our minds that they are the Chromis nilotica 

 and Chromis Tristrami. 



9. Chromis nilotica. 



Chrovm niloticus, Cuv. Regno Anini. Sec. &c. 



Acen'na Zillii, Gervais, Acad. Sc. et Let. Montp. 1848, and Ann. Sc. Nat. 



3'- ser. X. p. l>0;?. 

 Coptodits Zi/lii, idem, Bull. Soc. Cent. Agr. de I'H^rault, I^jS, p. 80, pi. 4. 



f. 5-7, and Zool. et Pal. G.?n. p. 204, pi. xlv. f. 3. 



This fish has a very wide geographical range, being found 

 from Algeria (if our supposition is correct), certainly from the 

 Nile, to the coast of Mozambique. 



10. Chromis Tristrami. 



Haligenes Tristrami, Giintli. Proc. Zool. Soc. 1859, p. 471. pi. 9. f. B ; 



Gersais, Comptes Rend. Acad. Sc. 18C6, t. Ixiii. p. 7, and Zool. et Pal. 



Gen. 1809, p. 207. 

 Chromii Tristrami, (ninth. Fisli. iv. p. 2G9. 



M. Paul Gervais, writing as late as 1869, persists in quoting 

 Dr. Giinther's nomenclature and remarks as contained in the 

 ' Proceedings of the Zoological Society' ten years ago, and com- 

 pletely ignores the corrections which that naturalist has made 

 in his important work, ' Catalogue of Fishes,' vol. iv. p. 269, 

 of the existence of which M. Gervais does not seem aware. 



11. Salmo macrostigmaj Duni. 

 Hah. Oued Z'hour and its affluents in Kabylia, near Callo. 



12. Cyprinodon calaritanuSy Bonelli. 



C. calaritanics, Bonelli, = C. cyanogaster, Guich., female, -f- C. doliatus, 

 Gulch., male. 



Hab. Lake Bou-Kamira, near Bone ; Oued Gheir ; artesian 

 wells. Nile; south of Europe. 



* Zoologrie et Paleontologie Gen^rales, 1809, p. 202, pi. xlv. 

 Ann.&Mag.N.Uist. -Ser. 4. Vol. yu\. 30 



