v.J 



CETACEA. 



59 



processes of the anterior dorsal vertebrae, which, in their turn, 

 continue backwards the upper series of cervical transverse 

 processes. 



In the Physetfridie. (comprising P/iysekr, Hyptroodon, 

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

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

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



F<;. ao. Anterior surface of vertebra: of Dolphin (Globicef>kal*t me/at). ]. A fifth 

 thoracic ; H seventh thoracic ; i eighth thoracic ; t> first lumbar ; r rib ; m meta- 

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

 Deuro-central suture. 



those of the ordinary Dolphins ; but passing backwards, 

 instead 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 



