APPENDIX, No. 2. 



In the following appendix we have given the admeasurements of the intestinal canal and 

 number of vertebrae in all the species throughout the family AnatkUc, where we have been able to 

 obtain them : the former, as a specific character, is subject to very great variation, an increase in 

 age invariably producing a more lengthened measurement. The numbering of vertebra; in bird/ 

 generally is very difficult : the mode in which Ave have proceeded, though differing from other 

 authors, has at all events the advantage of simplification. We consider all those vertebrae anterior 

 to the ribs, and not having any attachment to them, cervical; the dorsal are those anterior to the 

 pelvinal bones, having ribs attached to them ; the sacral are those anchylosed together, and imme- 

 diately succeeding the dorsal, — to some of these ribs are attached, either true or false ; the 

 numbering of those, where this is the case, we have shewn by the smaller and last number in the 

 column headed No. of sacral vertebrae ; so that, in order to ascertain the true number, the smaller 

 one must be added to the greater. The caudal vertebrae arc those posterior to and not anchylosed 

 to the sacral. — In the numbering of the false ribs we have shewn their position by two figures, 

 the first referring to those anterior to the true ones, the latter to those placed posteriorly to them. 



N. B. The admeasurements are given in inches. 



NAME. 



Plectropterus Gambensis, F. 

 Bemicla Brenta 

 A i) sit segetum, F. 



cygnoides 



Cygnus Bewickii, M. 



atratus, F. 



olor 



ferus, F. 



Tadorna bellonii, M. 

 Dafila caudacuta, M. 

 Mareca fistularis, M. 

 Aia sponsa 



Querquedula erythrorhyncha, M. 



■ F. 



crecca, M. 



-F. 



Cyanopterus circia 

 Rnynchaspis clypeata, M. 



— ■ F. 



Chaulelasmus strepera 

 Anas boschas, M. 



F. 



Carina mosehata, M. 

 Melanitta nigra, F. 

 Fulignla Gesneri, M. 



marilla, M. 



cristata, M. 



F. 



Nvroca leucopthalmus, M. 



— ; F. 



Harelda glacialis 

 Clangula vulgaris, M. 



— __F. 



histrionica 



Mergua serrator, F. 



merganser, M. 



F. 



-j ~ s 



albellus, F. 



76 

 85 



143 



11 1 



127 

 123 



71 



59 



40 



3U 



30" 



48 



50 



89 

 83 



84 



79 

 78 

 62 

 49 

 an 

 77 

 80 

 13 

 37| 



54 

 49 



55 

 79 

 66| 

 53 



o a a 

 5 2 



10 

 7 



91 



4| 

 4l 

 3| 



3 



a 



24 



s 



3j 



4 

 3| 



31 



5 



35 

 5 



4 



4| 

 2 



2i 



1 



1 



6~ 

 3| 



13 



111 

 11 



11 



8* 



8J 



9 



3i 

 21 



21 

 5 



5h 

 5k 



9 



64 

 6| 

 I 



6 

 6 

 4| 

 4| 



4 

 3i 



23 



3 



If 



18 



18 

 18 



23 



23 



16 

 16 

 II 



14 



11 



14 

 14 



13 

 12 

 15 

 13 

 15 



16 



11 

 11 



14 



1 I 

 1 1 



14 



6 

 6 



7 



7 

 6 



6 

 8 

 7 



7 

 7 



13 

 I 1 

 15 



16 4 



15 

 13 

 14 

 12 



13 3 



11 3 



13 3 



14 3 



12 3 

 16 3 



13 3 



16 3 

 11 3 



15 3 



11 3 

 15 3 



17 3 

 15 3 



13 3 



14 3 



7 

 6 



7 

 7 

 7 



- S 



47 

 47 

 49 



57 



55 



15 



42 



43 



43 



II 

 41 



42 

 46 

 16 

 16 

 (6 



47 



15 

 45 



16 

 16 



11 



45 



8 

 6 

 6 

 6 



7 

 7 



G 



7 

 7 



7 



2 1 



1 I 



1 



2 1 



2 1 

 2 1 

 2 1 

 2 1 



2 1 



2 I 



2 1 



2 I 



2 1 



2 1 



2 1 



2 1 



2 1 



2 1 



2 1 



2 1 



3 1 



