LEMURS. 437 



and three on each side of the lower jaw, implanted vertically 

 and in parallel lines. (1) The molars are of simple struc- 

 ture, with a continuous outer coat of enamel, and a flat sub- 

 elliptic grinding surface : the upper ones are of unequal size, 

 the first being the smallest, and the second the largest : in the 

 lower jaw the inequality is less, and the last molar is the least. 

 The first and last molars above have but one root : the second 

 and third have each three roots. The first lower molar has two 

 roots, the second and third have each a single root. 



\69.Lemurid(S. — The Indris {Lichanotus, Illiger) are small tail-less 

 Lemurs, which, when full-grown, have but two incisors in the lower 

 jaw, of larger size than in other Lemurs, especially in the species 

 {Lich. Diadema) on which the sub-genus Propithecus has been founded. 

 The dental formula in the Lichanotus Indri and Lich. lanigcr, is : — 



2_2 1 1 2 2 3 3 



Incisors ^—^ : canines — ; premolars — : molars — : -= 30. 



1-1 ' 1-1 ' ^ 2-2 ' 3-3 



In the common Indri the upper incisors, especially the anterior 

 one, are proportionally larger than in the higher Lemuridcs, in 

 the woolly Indri (PL 114, fig. 6) they are very small. In both 

 species the canine has a trihedral straight compressed conical crown ; 

 the premolars have shorter compressed crowns : the first and second 

 molars have square, four-lobed crowns ; the last molar is tri- 

 angular and of smaller size. The lower canine (c) is directed obliquely 

 forwards parallel with the incisor, which it closely resembles in 

 the Lichanotus laniger ; in the common Indri it is longer and 

 larger. The premolar and molar teeth resemble those above, but 

 the last supports five tubercles. 



The dentition of the Malmags or Spectre-Lemurs (Tarsius) 

 offers a more insectivorous character ; (2) the formula is: — 



T . 2—2 . 1—1 -, 3—3 3—3 ^ 



Incisors — ; canmes — : premolars — : molars — : = 34. 



1—1 ' 1— 1 ' -^ 3—3 * 3-3 



The first upper incisor, as in the Shrews, is longer than the canine. 

 The inferior canines (c ) are characterised, as in other Lemuridce^ 



(1) In the general characters of the teeth of the Rodentia, p. 400, the convergence of the 

 molar series is noticed. 



(2) PI. 114, fig. 3. 



