216 SIXTH REPORT — 1836. 



Ci/pri/wi(!ca\ — Europe nourishes 32 species of this family : it 

 possesses, in common with America, tlie forms of harbiis, ahra- 

 niis, and leuviscus ; labeo, existing in the Nile, is also American ; 

 ci/prinus, go/no, tinea, and cohitis, which are European, have 

 not yet been proved to exist on the other side of the Atlantic : 

 while North America possesses catastoimis,/ii/drai'gi/ra,j)a'cilia, 

 lehias, fiinduliis, molhiesia and cyprinodon, unknown to Euro- 

 pean waters, besides the imcertain genera proposed by M. Ra- 

 finesque. 



Esocidce. — The fresh waters of America contain a greater 

 nmnber of species of this family than those of Europe, the only 

 one in fact in the latter country being the common pike or csox 

 Indus, which exists also abundantly in North America, tliough 

 it is confined to the eastern side of the Rocky Mountains. North 

 Africa is more productive, the Nile producing many vwrinyri, 

 and the Mediterranean yielding a single species each of alocepha- 

 lus, microstoma, stomias, and chauliodus, forms which have not 

 been detected on the western side of the Atlantic. Belone, 

 scomheresox and exoca-tus, are common to both sides of that 

 sea, and it is highly probable that some of the hemirumplii of the 

 Caribbean sea may follow the gulf stream further north : one 

 was taken this year on the coast of Cornwall*. 



SiluroidecB. — Though a considerable number of fish of this 

 family have been already discovered in North America only one 

 is known in Europe, viz., the silunts glanis, which inhabits the 

 rivers of Europe as far north as Sweden and Norway, as well as 

 those of Asia and North Africa. The ])imelodns horealis, the 

 most northerly of the family in America, goes no higher than the 

 54th parallel. The waters of Egypt nourish many species of 

 silurus, schilhus, bagriis, ^>«;»(?/o(/m«, synodoiitis, clarias, and 

 inalapterurus. 



Salmonuideee. — Upwards of thirty described species of this 

 family belong to Europe, which possesses all the generic forms 

 mentioned in our North American list, with the exception of 

 sfe?iodif.sf, and the addition of argentina and scojje/us, found in 

 the Mediterranean. Egypt produces two or three other forms, 

 one of them, niyletes, being common also to tropical America. 

 Some of the salmonoidece are the most northei'l}' of fresh water 

 fish. Several of the trouts of North-west America are probably 

 identical with Kamtschatka species, to which other names had 

 been previously given. This point, with many others, \vill 



* Yarkei-l, Br. Fishes, p. 397. 



\ Tliis gfiiiis or sub-geims, wliicli tliflcvs fiom tlie oihev suhnoncn in tlic teeth, 

 was first iiaiiicd in tlic Appendix to CajiUtin Back's narrative of his journey to 

 he niouth of the Thlevvccchoh. 



I 



