C. MONAcnus, F. Cuv. Mamm. Lith. t. 76, p. 31. G. ceanthosler- 

 nus, Pr. Max. G. ceanthocephala, Spix. 



** Lumbar vertebra; G. Head small. 



C. capucinus. (Old) G. Jlavus, Geoff. (Var.) G.fulvus, Desm. C. 

 gracilis, Spix. (7. chrysopus, F. Cuv. £. albifrons, Humboldt. 

 C nigro-vittatus, Natterer. 



C. cirrifer, Fr. Max. C. «?'#er, Geoff. ; Buff. Supp. vii. t. 28- 

 G. cristatus, F. Cuv. 



C. nvroLEUcus, Geoff. ; Buffon, v. t. 9. 



There are many skulls of this genus in the Museum from very 

 differently coloured specimens. The adult ones arc very much 

 alike in size, external form, and in dentition, offering no important 

 characters by which they can be divided into groups. (See Gray, 

 P. Z. S. 18G5.) 



Dr. Dahlbom arranges the specimens in the Faris Museum in 

 his " Tabula Synoptica," p. 1G4, thus :— 



I. The hair of the crown erect, subfasciculate. — 1. ft robustus ; 



2. G. clegans; 3. G. Pucker anii=G. capucinus, Geoff.; 4. 

 G clegans, var. 5. G. frontatus ; 6. G. cirrifer ; 7. G. vel- 

 lerosus. 



II. Hair of the crown adpressed. 



a. The beard of the cheek and throat very diffused. — 8. C. bar- 



batus ; 9. G. variegatus. 



b. Beard of check and throat less prominent ; crown defined 



with apalo edge.— 10. C. Jlavus; 11. C. Apclla. 



c. Check, chin, and throat hairy.— 12. G. capucinus ; 13. G. 



castaneus ; 14. G. versicolor ; 15. G. chrysopus. 



In the compilation of Lesson, Wagner, and Giebel, who depended 

 upon the descriptions of authors, without having the opportunity of 

 examining specimens to correct their theories, the species are mixed 

 together in a manner that is not confirmed by reference to the 

 specimens themselves, showing how dangerous it is to venture in 

 such compilations to go beyond the authors consulted. 



There seems to be a considerable difference in the length of the 

 toes of the stuffed specimens, and I considered it a good character ; 

 but I now suspect that it may depend on ago (as the younger stuffed 

 specimens always appear to have longer fingers and toes than the 

 older ones), and perhaps more on tho art of the preserver. 



Tho species may also be divided thus, by the colour of the fur : — 

 The greater number of specimens havo the front of the fore legs 

 and chest palo. 



I. Fur black or brownish-black.— G leucogenys, G cirrifer, G. 



vellerosus, G. leucoceplialus, G. hypoleucus. 



II. Fur yellow, or yellow-and-brown, or brown-and-ycllow 



