6 ARKIV FÖR ZOOLOGI. BAND 0. X:0 4:. 



the width of the nasals is strikingly different. The single 

 nasal of the Finland Reindeer is anteriorly at the middle of 

 the os jorcFmaxillare accessorium broader (21 mm.) than that 

 of the Swedish Reindeer (resp. 14 & 15 mm.); but posteriorly 

 just in front of the vacuity the former has increased only 

 with '/s of its anterior breadth (to 36 mm.) while the latter 

 is considerabl}^ more than twice as broad (resp. 36 & 41,. 5) 

 as in front and thus has attained a width which is as great or 

 even greater than that of the Finland Reindeer. In conse- 

 quence of the vaulted shape of the nasals in the Finland 

 Reindeer and the more flattened condition of the same bones 

 in the Swedish Reindeer the difference in width is less con- 



Fig. 3. Side view of skull ot Hangifer tarandus fennicus. 



spicuous in front and more apparent posteriorly if the com- 

 bined width of both nasals is measm-ed, as may be seen 

 from the table of measurements. The combined width of 

 both nasals in front is in the Finland Reindeer equal to the 

 width of a single nasal just in front of the vacuities, but in 

 the Swedish Reindeer the former measurement is S,ö to 13 

 mm. smaller than the latter. From this description, the 

 measurements and the figures (figs. 1 — 4) it may be easily 

 understood that the nasals of these two kinds of Reindeer 

 are very considerably different in shape. 



On a level with the middle of the nasals, or just be- 

 hind that point but w^ell in front of the vacuities there is on 

 either side of the nasals a deep depression (conf. fig. 4) 



