A DESCIUPTION OF SOME TASMANIAN SKULLS SMITU. 27 



the skull rests behind on the posterior inaTgin of the foramen 

 magnum. The alisplienoid, at its narrowest part on both 

 sides, measures 16 mm. The outer surface is markedly concave. 

 The suture between tiie alisphenoid and the temporal on each 

 side is on a prominent ridge. On the left side there is a 

 vertical ridge at some distance behind the junction of the 

 malar with tlie alisphenoid. 



Norma facidlis. — (PI. xii., fig. 2). On tlie right side the floor 

 of the nose appears at first sight to be continuous with the 

 incisive region by a smooth area, but a closer examination 

 shows that this area is crossed by a thin, rounded, low ridge, 

 which runs from the outer margin to the nasal spine, joining 

 the parastertial line before reaching the spine. Further, the 

 maxillary border of this side does not lose itself on the incisive 

 region, as it appears to do on superficial inspection, but curves 

 inwards and upwards, and reaches tlie nasal spine 5 mm. from 

 its most anterior point. On the left sid§ the maxillary border 

 has a similar course. The parasternal line in the form of 

 a distinct ridge, runs backwards, outwards, and upwards to 

 come into very close relation to the maxillary border. There 

 is no appearance on tliis side of a ridge corresponding to the 

 thin, low ridge present on the right side. The nasal spine is 

 distinct, though not large. The septum is deflected to the left 

 side. The anterior naresare fairly wide, the nasal index beinsr 

 57. -t. The gnathic index measured bj^ Flower's method is 

 106.5. The infra-orbital fossfe are very deep A sutura 

 verticalis is not present on either side. On the right side 

 there is a small accessory infra-orbital foramen, not in the 

 position usual for such a foramen, but below, instead of above, 

 the normal one. This foramen is continuous with a depression 

 passing transversely inwards and becoming continuous with a 

 foramen in the wall of the antrum. The vertical diameter of 

 the OS planum appears to be 9 mm., but the superior border is 

 diflRcult to determine on either side. The (n-bital index is 73.8 ; 

 the interorbital width is 17 mm. 



Norma basilari.-'. — (PI. xiii., fig. 1). The hard palate index is 

 110. The sutures of tlie palate are all obliterated. The anterior 

 palatine fossa is rounded in form ; its posterior margin is 

 bounded by a large knob-like projection which forms the 



