v.] 



CETACEA. 



53 



continue backwards the upper series of cervical transverse 

 processes. 



In the Physetcridcz (comprising Physeter, Hyperoodon, 

 Ziphius, and the allied forms) a very different and peculiar 

 arrangement occurs (Fig. 21). The transverse processes in the 

 anterior thoracic region (t) are placed quite similarly to those 

 of the ordinary Dolphins ; but passing backwards, instead 



Fig. 20. — Anterior surface of vertebrae of Dolphin {Globicephalus melas), \. a fifth 

 thoracic ; b seventh thoracic ; c eighth thoracic ; d first lumbar; r rib ; m meta- 

 pophysis ; t transverse process. The dotted lines indicate the position of the 

 neuro-central suture. 



of changing their position on the vertebrae, they gradually 

 become smaller, and finally disappear ; while, simultaneously 

 with their diminution in size, other processes (f) rise from 

 the body of the vertebra, in the situation of the capitular 

 attachment of the rib, which, rapidly increasing in length, 

 become continuous serially with the lumbar transverse pro- 

 cesses. In two or three vertebrae the two co-exist (Fig. 21, 



