PREHISTOEIC TIMES IN BRITAIN. 



561 



convexity of the fronto-lacrymal ridge is well marked, and, like the straight naso- 

 frontal suture and the two other peculiarities specified, serves to differentiate Sus 

 andamanensis from specimens of similar size from the Palaearctic region, and to show 

 that it is a member of the group represented by Sus cristatus. Again, this skull 

 resembles Sus cristatus and differs from Sus scrofa in being somewhat shorter, and 

 having the paroccipitals, temporal bullae, and pterygoid processes more crowded 

 together. The length of the nasals is a little less than that of the fronto-parietal 

 region in the vertical aspect, as is often, though not always, the case in Sus cristatus, 

 though very rarely, if ever, in Sus scrofa. 



Measurements of Skull of 



inches. 



Greatest frontal width between 

 ectorbital processes 



Least width on vertex 



Greatest interzygomatic width 



Height of occiput from inferior 

 border of foramen magnum 



Length of vertex from level of 

 supraorbital foramina to middle 

 of occipital ridge 



Horizontal distance from anterior 

 border of orbit to temporal 

 ridge ..... 



Length of intermaxillary along 

 alveolar border 



Maximum length of skull from 

 apex of intermaxillaries . 



Length of nasals .... 



Length from apex of intermax- 

 illaries to anterior edge of fora- 

 men magnum .... 



Sus ANDAMANENSIS,' FEMALE. 



3-3 

 0.8 

 4.65 



3-7 



4-5 



3-O.0 



inches. 



5-95 



5-5 



1-5 

 2-5 



Length from apex of frontal to 

 middle of occipital ridge . 



Length from middle of fronto- 

 nasal suture to middle of occi- 

 pital ridge . . . 



Length from anterior border of 

 orbit to posterior 



Greatest width of occiput . 



Breadth of nasals at commence- 

 ment of naso-frontal suture, 

 which is the broadest part of 

 nasals i-O 



Maximum width of intermaxillary 



region i'2 



Height of lachrymal along rim of 



orbit 17mm. 



Length of lachrymal along malar 



suture 8 mm. 



Length of molar series . . 2-0 



Length of premolar series . . 1-3 



Fig. 4. Orbito-lachrymal region of skull of wild Indian sow, Sus cristatus, British 

 Museum. See * Catalogue of Carnivorous, Pachydermatous, and Edentate Mammalia,' 

 1869, p. 334 (where this skull is catalogued as '716 m. Skull of young female. 

 Length io|^, height 7^ inches. Terai, Nepal; Dr. Oldham '), or Hand-List, published 

 1873, p. 64. 



. This skull has been figured to show the points in which it contrasts with the 

 British pig's skull (Fig. i) on the one hand, as to racial characters, and with the 

 Indian boar's skull (Fig. 6) as to sexual characters, agreeing as it does with the one 

 as to sex, and with the other as to age. 



It is, as may be seen by constructing two triangles with the three first measure- 

 ments given of it and of that of Sus cristatus (Fig. 6) respectively, a very much 

 smaller skull than that ; the principal points, however, enumerated in the description 

 of that skull, as differentiating it from Sus scrofa, can be recognised in its smaller 

 contours. The third molar in the upper jaw has the part posterior to its second 

 principal lobe much smaller relatively and absolutely than is the case in boars of Sus 

 cristatus ; this posterior factor, however, effloresces into as many as seven cusps in the 

 upper and five in the lower jaw of this specimen. 



O O 



