CEBLUS. — CEBUS. 23 



The Silky Howlek. Mycetes laniger. 



*a. Skull. Columbia. 

 *6. Skull. Brazils. 



The Black Howler. Mycetes niger. 



*a. Skull: male. Bolivia. From Mr. Bridges' Collection. 



b. Skull: female. Bolivia. From Mr. Bridges' Collection. 



c. Skull. Bolivia. From Mr. Bridges' Collection. 



d. Skull. From Mr. Stevens's Collection. 



e. Skull : female. 

 */• Skull. 



The Black and Yellow Howlek. Mycetes bicolor. 



•a. Skull. South America. 



b. Hyoid bone. South America. 



c. Skull. Para. Presented by J. P. G. Smith, Esq. 



The Guakiba or Yellow-handed Howler. Mycetes beelzebul. 



a. Skull. Para (South America). Presented by R. Graham, Esq. 



b. Skull. Para (South America). Presented by It. Graham, Esq. 



The Mantled Howler. Mycetes paLliatus. 



•a. Skull. Caraccas. From M. Salle's Collection. — The specimen 

 figured in P. Z. S. 1848, p. 138. pi. 6. 



The Caraya or Black Howler. Mycetes caraya. 

 Mycetes barbatus, Spix, Sim. Bras. pi. 38. fig. 9 (skull). 



CEBUS. 



Teeth : — Incisors || ; Canines j^j ; Premolars ^ I Molars |^? ;=36 



The Monk. Cebus monachus. 



*a. Skull. South America. 

 *b. Skull. Paraguay. 



c. Skull. From Mr. Brandt's Collection. 



d. Skull. From the Zoological Society's Collection. 



e. Skull. 



/. Skull. From the Zoological Society's Collection. 



The Larger Monk. Cebus robustus. 

 Laurent ct Iiazin, Ann. d'Anat. et de Phys. pi. 1. 8. fig, (dentition). 



