TUPAIID^. 



125 



Breadth at lachrymal notch 



„ canines ....... 



„ 2nd incisors ... ....... 



1st . . . . • 



„ orbital angle of parietals 



Least breadth between orbits . . . . . _ 



Length between post-palatine margin and inferior margin of foramen magnum 

 Greatest breadth between alveolar surface., external margin (between 2nd and 



3rd molars) . . . • . . . . . 



Breadth (external) half-way between posterior incisor and canine 



Lachrymal notch to tip of premaxillaries 



Length of alveolar border 



Breadth behind origin of zygomatic arch (lateral aspect of skull) 



Distance between tympanic bullse (anterior extremity) 



„ (posterior » ) , 



Depth of skull premaxillary surface to anterior extremity of nasals 



„ „ maxillary „ posterior „ „ . . . 



„ through posterior margin of palate 



„ „ highest point of parietal 



„ at middle of occipital crest to inferior margin of foramen magnum 

 Anterior extremity of symphysis of lower jaw to extremity of angular process . 



„ to condyle 



„ „ „ „ „ to coronoid process 



Length of alveolar surface .......... 



Depth through coronoid process ...... . . . 



„ from base of corono-condyloid notch ....... 



The skuU is much narrower than in either T. ferruginea, T. belangeri, or 

 T. cUnensis, and is slightly smaller than the skull of the last-mentioned species. 

 Its most striking peculiarities are the depressed character of the snout, which arches 

 downwards, and the regularly tapering form of the same part, the absence of a 

 constriction between the orbits or concavity in the upper margin of the orbit, which 

 is straight and continuous with the lateral margin of the snout. The nasals are 

 proportionately broader than in the foregoing species, and very little expanded pos- 

 teriorly. The supra-orbital foramen is distinctly removed from the orbital margin. 

 The intra-orbital region is not so constricted as in the other species. The base of 

 the malar is proportionately broader than in the species enumerated, and the per- 

 foration of the same bone is very small and situated on the ridge at the union of 

 the zygomatic process of the squamosal with the malar. The auditory bullae are 

 rounder and fuller than in the before-mentioned species. The teeth are smaller, 

 and the second incisor when fresh through the gum is more pointed than in any of 

 the other species, and closely resembles the canine, which, however, is broader and 

 more erect and nearly allied in form to the central cusp of the premolars. The 

 first incisor shows the anterior and posterior rudiments of the cingulum more dis- 

 tinctly than in T. ferruginea, T. belangeri, or T. cUnensis, and it is nearly equal in 

 length to the canine. The 2nd premolar, as pointed out by Waterhouse, has a 

 distinct inner lobe, but it is not peculiar to the species as its original describer 

 supposed, for it occurs also in T, ferruginea, although not nearly so prominently 

 developed, and it is also faintly indicated in T. hel^geri and T. cUnensis. The 



