356 
bodies, we may produce the Berlin 
Transactions as an evidence of the fact. 
In the fourth vol. of that work, tab. 18. 
fig. 3, is a representation of the trachea of 
the Goosander : and in the third vol. tab. 
7, fig. 5, is given the trachea of the Dan 
Diver. The difference between these in 
structure is so material, that they cannot 
possibly belong to the same species." 
" These not only differ in the bony laby- 
rinth at the bottom of the trachea, but 
that which belongs to the Goosander has 
two enlargements about the middle; 
whereas only one enlargement belongs to 
the Dun Diver/' 
Again, under the head of the Goosander, 
the same author observes: " In the 8th 
vol. of the Linnean Transactions, Mr. 
Simmonds remarks that there is so much 
smilarity in the structure of the Mergus 
Merganser and M. castor, even in the 
intestines as well as in the trachea, verte- 
brae of the neck, and number of tail 
feathers (which in both are eighteen) to 
warrant a conclusion that they are the 
same, differing only in age or sex. but 
