4 MEMOIRS OF THE CARNEGIE MUSEUM 



Most of the drawings illustrating the paper were prepared by Mr. W. S. 

 Atkinson of Stanford University. The photo-drawings are for the most part the 

 combined work of Professor W. Cogshall of Indiana University, Miss Maud Sie- 

 benthal, and myself. The final arrangement of the figures on the plates was the 

 work of the Editor, to whom I am indebted for much other kind help and crit cism. 



In the preparation of the account of the Ariinoe I had the assistance of Mr. 

 Owen Frazee. Mr. Elmer Deem assisted with the Doradince, and Miss Lola Vance 

 with the PimelodincE. The account of the Gymnotidoe was prepared by Dr. Max 

 Ellis. I have given no figures of the Gymnotidce, having reserved these for the 

 monograph of the family by Dr. Ellis, which is ready to go to press. The Scicenidce 

 were described by Mrs. Marian Durbin Ellis, and the accounts of Hemigrammus 

 and Hyphessobrycon are extracted from the monograph of these genera by Mrs. 

 Ellis, which is still in manuscript. 



Mrs. Rosa Smith Eigenmann has been of the greatest assistance in the prepara- 

 tion of this paper. Deprived of the pleasures and responsibilities of more formal 

 collaboration, she has critically read the manuscript and overseen the work of the 

 artists. 



