482 



THE AMERICAN NATURALIST 



[Vol. XL 



Arfiodacfi/la.~ AW the horned rumi- 

 nants have the condyles extended for- 

 ward and broadened out and curved 

 downward at their anterior ends. Cor- 

 related with this, as in the horses, the 

 articular surface of the atlas is extended 

 downward on its anterior face. In fight- 

 ing, the head is bent downward so that the 

 points of the horns will project forward 

 towards the foe. In this position the head 

 interlocks with the atlas so that when 

 the two animals come together with a 

 rush, there can be no dislocation. 



The atlas and axis are firmly bound 

 tnovtlu'r In lioaiuent., m. that the force 

 <.f the impact is tlin.un l,ack upon the 



i^ no daniirr ..}' a di.l... ation a> there is 



cross so'fion. ..f rl,.- , , ,i„ 1\ Ir and atlas 

 of the aoudad Or,, t , a./, In j.hu^ . .hows 

 how the two aiv ivcipnuallv (■iirvc<l at 

 thrir ventral .aid., -riic do'ttc.l line of 

 Fiu II .hou. ulnar .r, ,i<a. h u... taken. 

 A similar condition o(<ui.in the hornle.s 

 females and in the canifU and horses. 

 The females of the liorn.'d forms have 

 probably inherited this peculiarity from 

 the males; no reason is known for its 

 occurrence in the camels and horses. 



Primates. — In the lemurs the condyles 

 point baekward while in the Anthropoidea 



