206 MERISTIC VARIATION. [part I. 



lateral instead of lateral, while the cusp of the posterior is postero- 



2 N 



Fig. 37. Surface view of upper jaw of Brachyteles hemidactylus, described in 

 No. 199. From skull in Brit. 3Ius., 42, a. 



lateral. These two teeth stand thus in somewhat complementary 

 positions. B. M., 42, a. 



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



4—4 3—3 



Fig. 38. Surface view of upper teeth of Ateles marginatus, specimen described 

 in No. 200, and side view of both jaws together. The specimen is in Brit. Mus., 

 1214, b. 



