Anatomical Structure of certain of the Cetacea. 405 



vertebra which carries no rib, and this fact is undoubted, in- 

 asmuch as the skeleton was prepared as a natural skeleton ; but 

 this is seemingly only an individual variety, since in the skele- 

 ton of several others, and more particularly in that of the foetus 

 of the porpoise, no such appearance is met with. 



The skeletons of several specimens, of various ages, of the 

 Delphinus Phoccena, prepared with great care by my brother, and 

 whose skeletons are still in the Museum, shew that there are se- 

 ven cervical vertebrae 



Other specimens of the genus Delphinus. 



The want of symmetry in the bones of the cranium of the 

 narwal does not extend to all the Cetacea. We have seen 

 that it scarcely exists in the Delphinus Phoccena and Delphis. 

 There is in the Barclayan Museum the skeleton of a grampus, 

 which was stranded in the Frith. 



Cervical vertebras, ... 7 

 Dorsal and caudal, . . .56 



63 



Cranium very nearly symmetrical. 



Teeth ' : the two anterior teeth slope much forward ; 



SlriwBX 



they are small, and solid. 



There are twelve ribs on each side : and of these, eight are 

 articulated with the transverse processes of the vertebra? only. 



There is the cranium of a large description of grampus in 

 the same museum, in which the want of symmetry is very re- 



3E2 



