346 



MICROTIN.E 



Cheek-teeth (Figs. 97, 98) rooted, each tooth, in adults, 

 provided with two roots, one anterior, the other posterior ; their 

 re-entrant folds containing cement. Enamel thicker on convex 

 walls of inner salient angles of upper molars; but elsewhere 

 about equal on convex and concave walls. Salient angles alter- 

 nating, the dentinal spaces rather tightly closed in all teeth, 

 except m|. Enamel pattern (Fig. 98) of m^, rr?, m^ and 

 Trig normal; in^ with its first outer infold deep enough to close 

 the first pair of triangles substantially, its second outer infold 

 shallow, the anterior pair of triangles broadly confluent and the 

 third outer angle somewhat reduced; ir? with four outer and 



Fig. 97. — Dolomys hogdanovi Martino. 



a. Inner, b. outer view of eight mandibular ramus of type ; dissected to 

 show the closed cement spaces of the molars. 



c. Right mandibular ramus of adult; dissected to show molar roots. 



d. Left maxilla of adult skull ; dissected to show molar roots. 



three inner salient angles, its first outer infold shallow as ii 

 Alticola, etc., leaving the first triangle confluent with the anterioi 

 loop ; second and third triangles substantially closed ; fourtl 

 and fifth triangles (third inner and fourth outer salient anglesi 

 widely confluent with each other and forming the short posterioa 

 loop ; «?i with a posterior loop, five rather tightly closed trianglesi 

 and a short anterior loop, formed chiefly by the large fourtl 

 outer and fifth inner salient angles, the general shape of th| 

 anterior loop being somewhat nivaloid. 



In the young type specimen the upper incisors show rathe 

 more distinct traces of grooves. The upper molars (Fig. 98a| 

 present the usual youthful features, but no additional com! 

 plications are shown by m^. Similar remarks apply to w?2 ^^f 



