MAMMALIA. 4ol 



Genus 10. — JVIycetes. — Illit/er. 



Generic Character. — Incisory teeth J, canines \_^[, grinders 

 ^ ; total 36. Facial angle 30 degrees ; head pyrarnidical ; 

 visage oblique ; os hyoides extremely ventricose ; outside pro- 

 minent ; the anterior hands provided with a thumb; tail very 

 long ; naked at the lower extremity. 



Mycetes fusca. — The Guariba ; or Preacher Monkey. — 

 Plate V**. fig. 2. — Fur smooth, glossy, dark chestnut-brown ; 

 paler on the back and head ; with a round beard beneath the 

 chin ; feet and point of the tail brown. Size of a fox. Inha- 

 bits the woods of Guiana, in immense societies. 



Genus 11. — Cebus. — Erxleber. 



Generic Character. — Incisors \, canines J-}, grinders ^-« ; to- 

 tal 3Q. Facial angle 60 degrees ; the head round with a short 

 muzzle ; forehead somewhat prominent ; the occiput projecting 

 behind ; the ears rounded ; the os hyoides not prominent ; the 

 tail prehensile and hairy all over. 



Cebus fatueUus. — The Horned Sapajou. — Plate V*. fig. 8. 

 — Fur of the face reddish-brown, chestnut on the back, paler on 

 the sides, bright red on the belly, extremities and tail brown ; 

 with two strong brushes of hair elevated on the base of the fore- 

 head ; claws longish, and somewhat blunted. About the size of 

 a half-grown cat. Inhabits Guiana. 



Section 2d. — Sagoins. — Tail long, but not prehensile. 

 Genus 12. — Callithrix. — Cuvier. 



Generic Character. — Incisors *, canines J^;}, grinders ^^Ji; to- 

 tal 36. Facial angle CO degrees ; head small and rounded ; ears 

 long, mis-shapen ; tail somewhat longer than the body, covered 

 with hair, and not prehensile ; body slender, in proportion to 

 its size. 



Callithrix sciureus. — The Squirrel Monkey. — Plate V*. 

 fig. 9. — Colour of the fur, bright gold yellow; hands and feet 

 orange ; the head round ; nose blackish ; orbits of the eyes flesh- 

 colour ; ears hairy and ill formed ; under parts whitish ; tail 

 very long, with a black tip. Size of a squirrel. Inhabits Cay- 

 enne and Brazil, South America. 



Genus 13. — Actus. — Humboldt. 

 Generic Character. — Incisors •}, canines J^], grinders «;« ; to- 



