190 Prof. Owen on the Class Mammalia. 
Hippopotamus and twelve in the Camel. And the value of this 
distinction has been exaggerated owing to the common concep- 
tion of the ribs as special bones distinct from the vertebre, and 
their non-recognition as parts of a vertebra equivalent to the 
neurapophyses and other autogenous elements. The vertebral 
formule of the Artiodactyle skeletons show that the difference 
in the number of the so-called dorsal and lumbar vertebre 
not affect the number of the entire dorso-lumbar series: thus, 
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of perforation of the medullary artery at the fore and upper part 
g, and most of the 
Rumifiants. The fore part of the astragalus is divided into yer 
equal or sub-equal facets: the os magnum does not exceed, oF} 
* The extinct Lophiodonts form the sole known exception to this rule. 
