PEIMATES FEOM MADAGASCAR. 



121 



Nasal Begion. — The facial profile varies much in different specimens, in some cases 

 being decidedly steeper than in others. In the type specimen of L. julliji the profile 

 forms a nearly straight line from the coronal suture to the tip of the nasals. In others 

 the median suture of the nasals forms a concave curve. 



The distance between the inner pair of incisors is longer than in the case of 

 L. varius, and these appear to have been functionally less important than in the recent 

 species. The position of the alveoli shows a close resemblance to the condition of 

 L. insignis. 



Texfc-fi<?. 29. 



Vertex view of raised frontal area of : (A) Mesopropithecus pithecoides, (B) ArcJiceolemur edivardsl, 

 and (C) Lemur jidlyi. 



The Orhital Begion. — The postorbital bar is triangular in section. The posterior 

 surface is of variable breadth (in some cases its upper portion exceeding 5 mm.), and 

 shows the sharp inner edge which has been referred to in the case of Mesopropithecus, 

 PalcBopropithecus, and Archceolemur. The resemblance between this region and the 

 corresponding part of Mesopropithecus appears too striking to be due to mere 

 convergence. 



Temporal Begion. — The strong and massive character of the fossil is especially 

 apparent in the zygomatic arch, which is much higher and stouter than in any extant 

 Lemur. The base of the zygomatic process of the squamosal is especially broad and 

 strong, in this again resembling all the forms previously described. 



Dentition. — The description given of the dentition of the type specimen of L.jullyi 

 in my preliminary notice of this species will apply with hardly any modification to all 

 the specimens examined. The internal collar of the third molar is in some cases rather 

 more perfectly developed than in the skull originally figured in the ' Bulletin ' of the 

 Academie Malgache, thus bringing it slightly nearer to the condition of L. insignis. 

 It should also be here remarked that the imperfect skull described as L. maziensis must, 

 in view of the complete series now available for comparison, be classed with the species 

 now described. 



The fact that the mandible of these extinct Lemurs was much more massive than 

 that of any of the existing species must be correlated with the more massive teeth, 

 strong sagittal crest, and probably also the narrow postorbital frontal region, which we 

 have seen to be invariable features of all the extinct Lemuroids hitherto described. 



