78 NORTHERN ZOOLOGY. 



are, Scomber grex, Pelamys sarda, TricMurus lepturus, Elecate Atlantica, Lichia 

 glaucus, Caranx carangus, and Nomeus Mauritii. Several not only traverse the 

 Atlantic from side to side, but also range through other seas : thus Thynnus 

 pelamys and Seriola cosmopolita are known on both sides of the Atlantic and in 

 the Indian Ocean. Auxls vulgaris, which is common to the Mediterranean and 

 Caribbean seas, also extends to the Indian Archipelago, if the Taso of New Guinea 

 be the same species. Vomer Brownii visits both sides of the Atlantic, and also 

 the sea of Peru. Many of the species mentioned above as traversing the Atlantic, 

 exist also in the Mediterranean ; and there are several others which have an exten- 

 sive range in the latter sea, and through the whole eastern side of the Atlantic, 

 though they do not cross to America, such as Scomber scombrus, Lepidopus argy- 

 reus, Xiphias gladius, and Naucrates ductor *. Trachurus saurel exists in the 

 Mediterranean, and on the east side of the Atlantic, from the English Channel to 

 the Cape of Good Hope : it is also found in the Indian Ocean, and in all parts of 

 the Pacific, but not on the American side of the Atlantic. Pelamys Chilensis has 

 been taken on both sides of the Pacific, namely, at Japan and Valparaiso. The 

 genera peculiar to a single district of the ocean may be known by a reference to 

 the subjoined table. They are fewer in proportion than in the preceding families, 

 and mostly contain only a single species. There are very few fresh-water or river- 

 fish in the family. Rhynchobdella and Mastacembelus inhahit the rivers and 

 ponds of India, one species of the latter existing in a river near Aleppo. Nota- 

 canthus is supposed to inhabit the rivers of Greenland. 



* Xiphias gladius is enumerated by Dr. Smith in his list of the fish of Massachusetts, but as he has included several 

 other European species in his list, on very insufficient grounds, further evidence is required of its being an American fish. 



