44 LEMUELS. 



I. Either only two upper incisors, or four of unequal size ; 



the inner pair much larger than the outer. Tail 

 present, hut very short. Limbs not remarkahly 

 slender '. NYCTICEBUS. 



II. Four small upper incisors of equal size. Tail none. 



Limbs very slender LOBIS. 



The lemurs of the Oriental region afford one of the most 

 remarkable and interesting examples of geographical distribution 

 known. The nearest allies of Nycticebus and Loris are two genera, 

 Perodicticus and Arctocebus, found only in West Africa. Nycti- 

 cebus has an extensive range east of the Bay of Bengal, but has not 

 been recorded from the Himalayas ; Loris is peculiar to Southern 

 India and Ceylon. 



Genus NYCTICEBUS, Geoffroy, 1812. 

 Syn. Stenops, v. d. Hoeven. 



Head short; limbs moderately stout; body slender; tail very 

 short ; ears short, rounded, and covered with hair ; eyes large and 

 approximate ; second digit of both hand and foot very short, that 

 of the foot with a long -claw, all the other digits with a broad nail. 



Fig. 11. Skull of Nycticebus tardigradus. 



The skull is globular behind ; the muzzle produced, but not very 

 narrow anteriorly ; orbits large. The greatest breadth of the skull 

 is across the zygoinatic arches. Vertebral formula : C. 7, D. 16-17, 

 L. 6-8, S. 3, C. 11-12. 



Dentition : i. ^ or ?=- 2 , c. , pm. |=f, m. g. When there 

 are two pairs of upper incisors, the inner are much larger than 

 the outer. The last upper molar has but three well-developed 

 tubercles, two outer and one inner. 



26. Nycticebus tardigradus. The slow Loris. 



Lemur tardigradus, L. Syst. Nat. p. 44 (17(56), excl. syn. 

 Nycticebus bengalensis, Geoffr. Ann. Mus. xix, p. 164 (1812). 



