96 



MAMMALIAN ANATOMY 



For these reasons there is a uniformity throughout the series of 

 lumbar vertebrae such as obtains in no other group, a uniformity 

 which renders it extremely difficult to recognize the different members 



FIG. 67. 



fourth. 



Fifth. 



THE FOURTH AND FIFTH LUMBAR VERTEBRA. 



of the series in a collection of vertebra derived from animals of all 

 ages and degrees of muscular development. The task is much easier 

 when the lumbar vertebne of one skeleton are studied. 



FIG. 68. 



Sixth. 



Seventh. 



TIIIC SIXTH AND SEVENTH LUMBAR VERTEBRA. 



Iii either case, however, the following differences will be observed : 

 The bodies and the neural arches increase in size from the first to 

 the fifth ; in the seventh thev are much shorter. 



