CETACEA. 



53 



continue backwards the upper series of cervical transverse 

 processes. 



In the PhyseteridcB (comprising Fhyseter, Hyperoodon, 

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

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

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

 of the ordinary Dolphins ; but passing backwards, instead 



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

 thoracic ; b seventh thoracic ; c eighth thoracic ; d iirst lumbar; r rib ; ;« 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 (/') 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 vertebra the two co-exist (Fig. 21, 



