EXPLANATION OF PLATES 



Plate 1 



Upper figure, dorsal view of mandible; and lower figure, ventral view of asym- 

 metrical skull of monkey — Lasiopyga griseoviridis (No. 15720, Mus. Comp. 

 Zool.). 



Plate 2 



Upper figure, frontal view;' and lower figure, dorsal view, of asymmetrical 

 skull of Lasiopyga griseoviridis. 



Plate 3 



Ventral view of asymmetrical skull of gorilla — Gorilla beringci mikenensis (No. 

 239883, U. S. Nat. Mus.). 



Plate 4 



Upper figure, right, lateral view of maxillary molars; and lower figure, dorsal 

 view, of asymmetrical skull of gorilla. 



Plate 5 



Upper figure, frontal view of asymmetrical skull of gorilla. Lower figure, 

 frontal view of asymmetrical skull of male sea lion — Eumetopias jubata (No. 

 4964, Mus. Vert. Zool.). 



Plate 6 



Upper figure, dorsal view of mandible of asymmetrical gorilla. Lower figure, 

 dorsal view of asymmetrical mandible of male sea lion (No. 4964, Mus. Vert. 

 Zool.). 



Plate 7 



Upper figure, dorsal view; and lower figure, ventral view, of asymmetrical 

 skull of male sea lion (No. 4964, Mus. Vert. Zool.). 



Plate 8 



Upper figure, dorsal view; and lower figure, ventral view, of asymmetrical 

 skull of female sea lion — Eumetopias jubata (No. 131895, Biol. Surv. coll.). 

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