04 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,! Pirate 
Perch,? large-mouthed Black Bass,? Sun-fishes and 
some Cat-fishes. 
(2) Channel-fishes; as the Channel Cat-fish,* 
the Moon-eye,® Gar-pike,® Buffalo-fishes,’ and 
Drum? 
(3) Upland fishes; as many of the Darters, 
Shiners and Suckers, and the small-mouthed 
Black Bass.® 
(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!° and the Great Lake Trout; 
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 Linneus. 
2 Aphredoderus sayanus Gilliams. 
8 Micropterus salmoides Lacépéde. 
4 Ictalurus punctatus Rafinesque. 
5 HHiodon tergisus Le Sueur. 
8 Lepisosteus osseus Linneus. 
1 Lctiobus bubalus, cyprinella, ete. 
8 Aplodinotus grunniens Rafinesque. 
® Micropterus dolomieu Lacépéde. 
1 Coregonus clupeiformis, artedi, etc. 
1 Salvelinus namaycush Walbaum. 
