JOG .MK1M-T1C VARIATION. [PAKT I. 



lau-r:d in-t.-ail of lateral, while the cusp of the posterior is 



I i . H7. Surface view of upper jaw of Brachyteles liemidactylm, described in 

 N.p. I'.t'.i. From skull in lirit. .!/., 42, a. 



latrral. Tln'M- two teeth stand thus in somewhat complementary 

 positions. 15. M., 42, a. 



*200. Ateles marginatus : wild specimen from river Cupai, has 



^ ^ 3 3 



.. :H. Surface view of uppi-r teeth of .-!/,/,.< iii<ii-iiiii<itiia, specirneu described 

 in Nn. JIM i. Mini siile \i.-\v of Imtli ja\v> tori'tliir. The specimen is in lirit l///- 

 1-J1I. /,. 



