VIII . VERTEBRAE OF ANTEATERS 163 
The first of these characters is the series of additional 
zygapophyses on the posterior dorsal and lumbar vertebrae ; 
these are very clear in the Anteaters and Armadillos ; less clear, 
but still obviously represented, in the Sloths. In the second 
place, they all possess a clavicle, rudimentary, it is true, in the 
Fic. 89.—Great Anteater (Myrmecophaga jubata). A, Side view of twelfth and thirteenth 
thoracic vertebrae. B, Posterior surface of second lumbar vertebra. ©, Anterior 
surface of third lumbar vertebra. x3. az, Anterior zygapophysis ; a2!, a2, az’, 
additional anterior articular facets ; cc, facet for capitulum of rib; m, meta- 
pophysis ; pz, posterior zygapophysis ; p2', pz, pz, additional posterior articular 
facets ; ¢, transverse process ; ¢c, facet for articulation of tubercle of rib. (From 
Flower’s Osteology.) 
Great Ant-bear, but still present. Thirdly, the testes are 
abdominal throughout life, a character which they share with 
such lowly-organised animals as the Monotremata and _ the 
Whales. Finally, and this is by no means a matter to be over- 
looked, not only are all the existing members of this group 
American in range, but there is no evidence to prove that they 
have ever existed elsewhere. No European or Old-World repre- 
