POLISH SWAN. 



185 



C immutahilis protrudes considerably more, and there arc 

 two oval foramina, one on eacli side just above \\\q formnen 

 magnum, wliicli are not present in any specimens of C. olor 

 that I have examined ; the portion forming the boundary of 

 the external orifice of the ear is much more prominent, and 

 the condyle forms a more acute angle with the basilar portion 

 of the occipital bone. 



I have verified all Mr. Pelerines observations. 



