228 ANATID^E. 



was shot in the winter of 1840-41. This species, hdwever, 

 does not appear to have been distinguished elsewhere from 

 the Mute Swan, and I am therefore unable to name any 

 foreign geographical localities as producing it, beyond the 

 probability of its inhabiting those countries in the vicinity 

 of the Baltic. 



In the adult bird the beak is reddish-orange ; the nail, 

 lateral margins, nostrils, and base of the upper mandible 

 black ; the peculiarity of the nostril has been noticed ; the 

 tubercle, even in an old male, of small size ; the irides 

 brown ; the head, neck, and the whole of the plumage 

 pure white ; legs, toes, and intervening membranes slate- 

 grey. 



From the point of the beak to the end of the tail fifty 

 seven inches. From the carpal joint to the end of the 

 second quill-feather, which is the longest in the wing, 

 twenty-one inches and a half; tarsus four inches ; middle 

 toe and nail five inches and three-quarters. 



Its food and habits closely resemble those of the Mute 

 Swan. 



The organ of voice appears, from one that I examined, 

 to be like that of the Mute Swan ; but Mr. Pelerin has 

 found considerable differences in various parts of the head ; 

 the description arid measurements were given in a paper 

 published in the Magazine of Natural History for 1839, 

 page 178, from which the following is an extract. 



The measurement of an adult cranium of each is as 

 follows : Length, from the tip of the bill to the base of 

 occipital bone in C. immutabilis, six inches and three- 

 eighths ; C. olor, six inches and seven- eighths. Height, 

 from the bottom of the lower mandible when closed, to 

 the top of the protuberance at the base of the bill, in C. 

 immutalilis, one inch and five-eighths ; C. olor, two inches. 



