188 



MICROTIN^ 



the zygoma looks more directly forwards than in cfther members 

 of the group. Interorbital region in fnlly addt skulls rather 

 long and narrow; shorter and broader in young adults. Tem- 



Fia. 70. — Lenimiis lemmus Linnfeus. 



Dorsal, ventral, and lateral views of skull ; the small figure shows the skull 



in dorsal view, natural size. 



poral ridges in adults fusing into a sharp and salient median 

 interorbital crest; in their backward course over the braincase 

 the ridges, sharply salient throughout, diverge to points in linej 

 with the front edges of the glenoid articulations; thence thej 

 are convergent to the hinder part of the parietal region, where 



