REV. W. HIXCKS ON CTftNUS PASSMORT. 5 



lu G. Fassmori the naked black skin reaches the eye, but does 

 not surround it as in Q. huccinator, where a narrow black border 

 encloses the eye. 



In conclusion, I propose the following character for C. Passmori : 



Cygnus Passmori, Hincks. Albus, capite, cervice et pennarum extre- 

 mitatibus pallide cinereis, rostro etuberculato et pedibus nigris, fronte 

 subangulatim prominente, trachea intra carinre parietes et sterni 

 tumorem anteriorem uncialem flexa. 



To Sir J. Richardson's character of Cygnus huccinator I propose 

 to add : — 



Fronte curvatim prominente, trachea intra parietes carinse flexa, anfrac- 

 tum cordiformem paulum intumescentem faciente parte posteriore 

 sterni, tunc tumorem alterura biuncialem dextrorsum inclinatum parte 

 anteriore. 



The accompanying figure of the head and neck is taken from a 

 photograph by Mr. Octavius Thompson, of Toronto, from the only 

 specimen yet obtained of Cygnus Passmori ; and I am indebted 



for the drawings of the sternum of Cygnus huccinator to my 

 friend Charles Fuller, Esq., of Toronto. 



EXPLANATION OF THE FIGURES. 



Fig. 1. Side view of the beak of Cygnus Passmori, natural size. 

 Fig. 2. Similar view of the beak of Cygnus huccinator. 



Figs. 3, 4, & 5. Diagrams showing the different figure of the forehead in the 

 three American species of Swan. 



