8 ARKIV FÖR ZOOLOGI. BAND 6. N:0 4, 



downward (conf. fig. 2). It has thus quite a different shape 

 in the two races. 



A very remarkable difference is that the upper molar 

 series of the Finland Reindeer, in spite of its skull being 

 considerably larger, is much shorter, only 85 mm., than in 

 the smaller Swedish Reindeer resp. 98,5 and 96 mm. The 

 same is also the case with the lovver molar series which 

 measures in the former 90 mm. in the latter resp. 104 and 

 103,5 mm. The length of the upper molar series is thus in 

 the Finland Reindeer only 23,8 7o of the basicranial length 

 but in the Swedish Reindeer the same percentage is 29,4 to 

 30,0. This difference is the more striking as the facial por- 

 tion of the skull of the Finland Reindeer is even comparati- 

 vely more elongated than in the typical JRangifer tarandus 

 while the length of the cranial portions shows less difference. 



The orbits of the Finland Reindeer are much more pro- 

 truding than those of a Swedish Reindeer. This is caused 

 partly by the orbital brims being broader, but also by a 

 deep concavation being formed in front and below the orbit 

 for the insertion of the masseter (conf. fig. 3). This con- 

 cavation which by a ridge is separated from the lachrymal 

 fossa lies mainly on the zygomatic bone which is very broad 

 and large in this animal. In front of this the maxillary bul- 

 ges out again to a convexity (conf. fig. 4). In the Swedish 

 Reindeer the zygomatic and maxillary slope rather evenly 

 into each other below the orbit so that only a very slight de- 

 pression is effected for the insertion of the masseter. 



From the table of measurements may be seen that the 

 width of the skull of the Finland Reindeer, as well,is larger 

 than the corresponding measurements of the Swedish Rein- 

 deer. As a rule, however, this difference stånds in corre- 

 spondence with the generally greater size of the former. But 

 the occipital condyles have another shape in the Finland 

 Reindeer and are more transversally extended than in the 

 members of the typical race. The width between the extreme 

 lateral ends of the articular surfaces is in the former 82 mm. 

 and in the latter only from 66 to 68 mm. The condyles 

 have also another position in the two races, in the Scandi- 

 navian race they stånd more vertically, and in the Finland 

 race they are more transversally extended. In consequence 

 of this the contour-line of both condyles w^hen seen from be- 



