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, thi.'v all possess a clavicle, rudimentary, it is true, in the 



Fig. 89. — Great Aiiteater {Mijriiiecophaga jubata). A, Wide view of twelfth and tliirteenth 

 thoracic vertebrae. B, Posterior surface of second lumbar vertebra. C, Anterior 

 surface of third lumbar vertebra, x §. a2, Anterior zygapophysis ; nr}, az^^ az'\ 

 additional anterior articular facets ; cc, facet for capitulum of rib ; in, meta- 

 pophysis ; pz, posterior zygapophysis ; pz^, pz^, ^>s^\ additional j^osterior , articular 

 facets ; t, transverse process ; ic, 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. Xo European or Old- World repiv- 



