PEIMATES PROM MADAGASOAE. 



115 



the orbits are directed more outwardly and upwardly than in full-grown specimens, 

 and are relatively larger in the young skull. An index showing the vertical orbital 

 diameter as compared with the maximum length of the skull gives, in the case of the 

 young animal, 16-4 per cent. This feature again brings it nearer to the recent Lemurs. 

 The contour and proportions of the supraoccipital bone very closely resemble the 

 condition seen in recent Indrisinse. 



An almost perfect mandible was found accompanying the skull, and in this, again, 

 there are certain features of interest. The symphysis is already firmly fused, with 

 hardly a trace of the suture. The anterior part of the mandible, although sloping 

 forward considerably, does not yet show the strange spout-like prolongation so 

 characteristic of this species of Megaladapis. A milk-incisor is still present, and 

 occupies a less procumbent position than do the incisors of the full-grown animal. 

 Its form does not at all recall the incisors of the adult, being flattened in a direction 



Table 12. — Showing dimensions of the skull in the three species of Megaladapis. 



Skull. 



From inferior border of foramen magnum to anterior 



margin of premaxillee 



Maximum length of skull 



From anterior margin of orbit to upper border of 



foramen magnum 



From posterior border of palate to anterior margin 



of premaxillae 



Total length of dental series 



Length of series of molars and premolars 



Diameter of orbits 



Maximum height of skull with jaw in position . . . . 



., vertical height of brain-case 



„ bi-zygomatic breadth 



,, external breadth of brain-case 



Transverse diameter of foramen magnum 



Vertical diameter of foramen magnum 



Maximum breadth of skull between middle of orbits. 



Distance between laorymal foramina 



Breadth of palate between postero-external angles of 



third molars 



Angleof intersection of planes through orbital margins. 



Manbiblb. 

 Distance from condyle to summit of symphysis . . . . 



Height of symphysis 



Length of series of three molars 



M. grandidieri. M. edivardsi. M. madagascm-ietisis. 



266 

 292 



168 



130 



137 

 82 

 33 



173 

 67 



127 

 70 

 26 

 24 



135 

 70 



69 



90° 



230 

 86 



58 



230 



288 



156 



126 

 94 

 36 



192 



89 

 150 

 57 

 18 

 25 

 110 

 67 



70° 



192 

 70 

 80 



mm. 



215 

 ? 



142 



? 

 ? 



75 

 26 

 ? 



68 

 100 

 58 

 17 

 20 

 111 

 63 



56 



100° 



? 

 53 



VOL. XVIII. — PART II. No. 8. — May, 1908. 



