FISHES OF LAKE SUPERIOR. 291 



and Huro or Grystes, which all occur in the lower lakes, to show 

 that this is the case ; and at the same time to indicate the great dif- 

 ference there is between the fishes of the upper lakes and those of 

 the lower. 



A comparative list of the Percoids of the two regions will show 

 better than words, that notwithstanding the free passage there is 

 between all these waters, notwithstanding the great similarity 

 between the waters themselves, there is an organic difference 

 between the ichthyological faunae of the two regions. 



Lower Lakes. Lake Superior. 

 Centrarchus asneus. 



Pomotis vulgaris. 



Huro nigricans. 



Grystes striatus. 



Perca flavescens. Perca flavescens. 



Lucioperca americana. Lucioperca americana. 



This list shows not only the great difference there is between the 

 fishes of the upper and lower lakes, but also how closely the ichthy- 

 ological fauna of Lake Superior resembles that of northern Europe, 

 where the same genera of Percoids have representatives as in the 

 north of this continent, a fact which goes farther to show how much 

 more uniform the fauna of the north is than even the fauna of the 

 temperate zone. 



PERCA FLAVESCENS, Cuv. 



PERCA FLAVESCENS Cuv. R. Anim. 1817, II., 133.-- Cuv. et Vol. 



H. N. Poiss. 1828 ; II., 46. --Richards. Fn. Bor. Amcr. 1836, 



III., p. 1., PI. 74. Storer Rep. 1839, p. 5. Ay-res Bost. Journ. 



Nat. Hist. 1842, IV. 256.--Zte% N. York Fauna, 1824, 



p. 3. PI. L, f. 1. 

 BODIANUS FLAVESCENS Mitch. Tr. Lit. Phil. Soc. N. Y. 1815, L, 



421. --Kirtl. Rep. Zool. Ohio, p. 169-190. 

 MORONE FLAVESCENS Mitch. Rep. Fish. N. York. 

 PERCA ACUTA Cuv. et Veil. H. N. Poiss. 1828, II., 49, PI. 10. 



Richards. Fn. Bor. Amer. 1836, III., p. . Dekay N. Y. 



Fauna 1842, p. 6, PI. 68, f. 222. 



