Cetacea. 1537 



Inches. Lines. 

 Length of the superior maxillaries, from the apex 



to the end of the zygomatical apophysis 254 



From the superior apophysis to the zygomatic apo- 

 physis ...» .... .... .... .... 8 10 



Length of the intermaxillaries .... .... 28 1 



Greatest transverse breadth of the frontal bone ... 114 



Greatest height of ditto as far as the temporal crest 8 10 



Length of the jugal bone .... .... .... 8 3 



From the extremity of one of the apophyses of the 

 temporal bone to the apex of the other apophysis 



of the same bone .... .... .... .... 7 



Length of the occipital bone as far as the condyles IO4 



Length of the lachrymal bone .... .... .... 2 10 



Length of the lower jaw .... .... .... 40 



Length of the upper apophysis of the inferior max- 

 illaries .... .... .... .... .... 2 1 



Vertebra. The vertebral column is formed of 

 7 Cervical vertebrae. 



1 1 Dorsal. 



12 Lumbar. 

 1 Sacral. 



17 Caudal. 



Total .... 48 vertebrae. 



Cervical vertebra ; atlas very large (three times as large as the axis), 

 spinal processes wanting, transverse ones short, and inserted ob- 

 liquely. Axis small, its spinal processes long, not united at their sum- 

 mits ; transverse processes produced. Third vertebra ; spinal pro- 

 cesses united, forming a V, and furnished each with a lateral appen- 

 dage ; transverse processes shorter than those of the axis. Fourth 

 and fifth vertebra ; spinal processes united at the summit, and furnish- 

 ed with very strong and robust lateral appendages ; no transverse 

 processes. Sixth and seventh vertebra ; spinal processes united at the 

 summit, transverse ones long, geniculate and directed backwards. 



Dorsal vertebra, supporting ribs, the two first of which are alone 

 joined to the sternum. First, spinal processes forming a V, which 

 shape is continued all through the dorsal and lumbar vertebrae ; this 

 first dorsal vertebra has its spinal processes not forming a lengthened 

 blade after their union, it has two transverse processes on each side, 

 iv 6 D 



