234 



1248. The sternum and scapular arch of a Wild Swan (Cygnus ferus}. The course 

 of the trachea within the keel of the sternum is exposed on the right side. 



Presented by Sir Everard Home, Bart., F.R.S. 



1249. The sternum and scapular arch of a Wild Swan (Cygnus Bewickii). The 

 trachea is preserved in connection with this specimen; and the horizontal 



. position of the terminal fold, characteristic of the species, is shown. 



Presented by Dr. Leach, F.L.S. 



1250. The skeleton of the Mute Swan (Cygnus olor). 



There are 30 vertebrae between the skull and sacrum, of which the last six support move- 

 able ribs : five other pairs of moveable ribs are attached to sacral vertebrae ; the third to the 

 ninth pairs inclusive are attached by bony haemapophyses to the sternum. 



Hunterian. 



1251. The skeleton of the Mute Swan (Cygnus olor). Presented by Mr. Dubois. 



1252. The skull of the Mute Swan (Cygnus olor). Hunterian. 



1253. The skull of the Mute Swan (Cygnus olor). Hunterian. 



1254. The skull of the Mute Swan (Cygnus olor). Hunterian. 



1255. The skeleton of the Black Swan (Cygnus atratus). 



There are 30 vertebrae between the skull and sacrum, of which the last seven support 

 moveable ribs : the first rib is rudimentary ; the second free and floating ; the succeeding 

 five articulate with the sternum by bony haemapophyses ; the last four pairs of ribs are 

 attached to the sacrum, and the first three of these also articulate by their haemapophyses 



with the sternum. There are 8 caudal vertebrae. 



Purchased. 



1256. The skeleton of a Black Swan (Cygnus atratus). It shows the same vertebral 

 formula as in the preceding 'specimen. Mus. Brookes. 



1257. The skull of a Black Swan (Cygnm atratus). Purchased. 



