PRIMATES FEOM MADAQASCAE. 



95 



the broad condyle, the wide-spreadmg angle of the lower marguis of the mandibular 

 rami carrying the lower edge of each ramus outwards to such an extent as to cause the 

 posterior molars to overhang within the jaw, such are some of the characters in which 

 Mesopropithecus approaches Archceolemur and in most of which also it resembles the 

 ordinary Simian type of mandible (see text-fig. 18, where the mandible of Mesopro- 

 pithecus is compared with those of Colohus and Pithecia). The mandibular symphysis 

 has about the same relative length as in Propithecus. The lower incisors are missing, 

 but the alveoli show them to have been somewhat rounded in section and not laterally 

 flattened as in the existing genera. The outer pair were larger than the inner and the 

 alveoli of the inner pair are decidedly anterior in position to the outer, herein again 

 resembling Arc/iceolemur. All four incisors appear to have been somewhat procumbent, 

 the angle approximating to that seen in Propithecus. 



The anterior premolars are missing in our specimens, but the remaining teeth bear a 

 very close resemblance to those of Indris and Propithecus. The first premolar is much 

 everted at its anterior margin. 



The three molar teeth call for no special notice, except to state that they are in 

 general stouter and broader than the corresponding teeth of Indris and Propithecus 

 and in their conformation show affinities with both these genera. 



Table 5. — Showing affinities oi Mesopropithecus with recent Indrisinae 

 and with Archceolemur. 



