94 SCIENCE SKETCHES. 



America, north of the Tropic of Cancer, these 

 representing thirty-four of the natural families. 

 As to their habits, we can divide these species 

 rather roughly into the four categories pro- 

 posed by Professor Cope, or, as we may call 

 them, 



(1) Lowland fishes; as the Bow-fin, 1 Pirate 

 Perch, 2 large-mouthed Black Bass, 3 Sun-fishes and 

 some Cat-fishes. 



(2) Channel-fishes ; as the Channel Cat-fish, 4 

 the Moon-eye, 5 Gar-pike, 6 Buffalo-fishes, 7 and 

 Drum. 8 



(3) Upland fishes; as many of the Darters, 

 Shiners and Suckers, and the small-mouthed 

 Black Bass. 9 



(4) Mountain-fishes; as the Brook Trout, and 

 many of the Darters and Minnows. 



To these we may add the more or less distinct 

 classes of (5) Lake-fishes, inhabiting only waters 

 which are deep, clear, and cold, as the various spe- 

 cies of White-fish 10 and the Great Lake Trout; 11 



regions of Asia and Europe is about 360. The fauna of India, 

 south of the Himalayas, is much more extensive, numbering 625 

 species. This latter fauna bears little resemblance to that of 

 North America, being wholly tropical in its character. 



1 Amiatus calvus Linnaeus. 



2 Aphredoderus sayanus Gilliams. 

 8 Micropterus salmoidcs Lacepede. 



4 Ictalurus punctattis Rafinesque. 



5 Hiodon tergisus Le Sueur. 



6 Lepisosteus osseus Linnaeus. 



7 Ictiobus bubahis, cyprinella, etc. 



8 Aplodinotus grunnien s Rafinesque. 



9 Microptertis dolomicu Lacepede. 



W Coregonus clupeiforinis, artedi, etc. 

 i 1 Salvelinus nciniayctish VValbaum. 



