\^,^^^ 



Fublications of the Carnegie Mmeum, Serial No. 67. 



MEMOIRS 



OF THE 



OAENEG-IE MUSEUM, 



VOL. V. 



W. J. HOLLAND, Editor. 



THE FUESHWATER FISHES OF BRITISH GUIANA, INCLUDING 



A STUDY OF THE ECOLOGICAL GROUPING OF SPECIES, 



AND THE RELATION OF THE FAUNA OF THE 



PLATEAU TO THAT OF THE LOWLANDS. 



By C. H. EIGENMANN, Ph.D. 



jL PITTSBURGH. 



PCBLISHED BY THE AUTHORITY OF THB BOARD OF TRUSTEES OF THE 



CARNEGIE INSTITUTE. 



June, 1912. 



