Freshwater Fish of Algeria. 389 



Gervais on the freshwater fish of Algeria*. He there al- 

 ludes to the discoverj of a species of Ga^terosteus (made, in 

 fact, bj us). This he imagines, despite of several secondary- 

 differences, to be referable to the variety common in the neigh- 

 bourhood of Paris, of which Cuvier has made his species G. 

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

 European species G. aculeatus. 



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 referred it. 



Our endeavours to obtain specimens of the Chromidas 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. 



Chromis niloticus, Cuv. Regne Anim. &c. &c. 



Accrina Zillii, Genais, Acad. Sc. et Let. Montp. 1848, and Ann. Sc. Nat. 



3« ser. X. p. 203. 

 Coptodus Zillii, idem, Bull. Soc. Cent. Agr. de I'H^rault, 1853, p. 80, pi. 4. 



f. 5-7, and Zool. et Pal. Gen. 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 ; 



Gervais, Comptes Rend. Acad. Sc. 1866, t. Ixiii. p. 7, and Zool. et Pal. 



Gen. 1869, p. 207. 

 Chromis Tristrami, Giinth. Fish. iv. p. 269. 



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 macrostigma^ Dum. 

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



12. Cyprinodon calaritanus^ Bonelli. 



C. calaritanm, Bonelli, = C. cyanogaster, Guicli., female, + C. doliatus, 

 Guich., male. 



Hob. Lake Bou-Kamira, near B6ne ; Oued Gheir • artesian 

 wells. Nile • south of Europe. 



* Zoologie et Pal^ontologie G^nerales, 1869, p. 202, pi. xlv. 

 Ann. d: Mag. N. Hist. Ser. 4. Vol. yin. 30 



