482 



grcBnlandicus, Dicrostonyx, 155 

 groenlandicus, Dicrostonyx hudson- 



ius, 155 

 groenlandicus, Hypudaeus, 155 

 groenlandicus, Lemnus, 155 

 groenlandicus, Mus, 155 

 groenlandicus, Myodes, 153, 155 

 gulielmi, Arvicola, 100 

 gulielmi, Dicrostonyx, 160 



hallucalis, Evotomys glareolus, 229 

 hallucalis, Evotomys nageri, 228, 229 

 harrisoni, Evotomys, 216 

 helaletes, Synaptomys, 170 

 helaletes, Synaptomys helaletes, 170 

 helveticus, Evotomys glareolus, 222 

 helveticus, E votomj's hercynicus, 222 

 helvolus, Arvicola (Georychus), 209 

 helvolus, Arvicola (Lemmus), 209 

 helvolus, Lemmus, 209 

 helvolus, Myodes, 209 

 Hemiotomys, 385 

 henseli, Dicrostonyx, 163 

 hercynicus, Evotomys hercynicus, 



218, 221 

 hercynicus, Hypudacus, 218 

 herc3Tiicus, Hypudaeus, 210 

 Herpetomys, 97; relationships of 



genus, 58 ; teeth figures, 59 

 Hipuda?us, 137, 180 

 Hipudaus hudsonius, 157 

 Hipudeeus norvegicus, 194 

 Hipudaeus torquatus, 148 

 hudsonia, Arvicola, 153 

 hudsonicus, Myodes, 153 

 hudsonius, Arvicola (Georychus), 157 

 hudsonius, Guniculus, 148, 153, 157 

 hudsonius, Dicrostonyx, 155, 157 

 hudsonius, Georychus, 153, 157 

 hudsonius, Hipudaeus, 157 

 hudsonius, Hypudajus, 167 

 hudsonius, Lemmus, 155, 157 

 hudsonius, Lemnus, 157 

 hudsonius, Mus, 137, 157 

 hudsonius, Myodes, 148, 155, 157 

 hudsonius, Spalax, 157 

 Hyperacrius,91,330; measurements: 

 external, 447, cranial, 472; re- 

 lationships of genus, 44 

 Hyperacrius aitchisoni, 336 

 fertilis, 334 

 ,, f. brachelix, 335 



„ f. fertilis, 334 



,, wynnei, 336 



Hypudacus, 210, 218 

 Hypudacus hercynicus, 218 

 Hypudc-eus, 137, 186, 210, 414 

 Hypudaeus amphibius [Arvicola], 394 

 „ glareolus [Evotomys], 



218, 221, 226 



Hypudieus gra3nlandicus [Dicro- 

 stonyx], 155 

 ,, hercynicus [Evotomys], 



210 

 ,, hudsonius [Dicrostonyx], 



157 

 „ migratorius [Lemmus], 



201 

 ,, nageri [Evotomys], 226 



,, norvegicus [Lemmus], 194 



,, paludosus [Arvicola], 404 



,, p. aquaticus [Arvicola], 



404 

 ,, rubricatus [Dicrostonyx], 



151 

 ,, rufocanus [Evotomys], 



211,248 

 rutilus [Evotomys], 239 

 ,, spelagus [Arvicola], 415 



,, terrestris [Arvicola], 401, 



404 

 ,, torquatus [Dicrostonyx], 



148 

 Hypudeus, 210 



idahoensis, Evotomys, 274 

 illyricus, Arvicola, 406 

 illyricus, Arvicola terrestris, 406 

 illyricus, Arvicola musignanoi, 406 

 illyricus, Microtus musignani, 406 

 imitator, Microtus, 315 

 Incisor teeth. Evolution of, 99 

 inez, Caryomys, 252 

 inez, Microtus (Caryomys), 262 

 inez, Microtus (Eothenomys), 211, 



251 

 innuitus, Synaptomys (Mictomys), 



170 

 innuitus, Synaptomys (Mictomys) 



innuitus, 176 

 insularis, Evotomys dawsoni, 266 

 intermedius, Arvicola (Evotomys), 



367, 363, 368 

 intermedius, Miorotomys, 368 

 intermedius, Microtus, 360, 368, , 



383 

 intermedius, Microtus (Mimomys),] 



375 

 intermedius, Mimomys, 365, 368, 378| 

 Introduction, 1 

 irkutensis, Evotomys (Craseomys),! 



248 

 istericus, Evotomys glareolus, 221 

 , italica, Arvicola amphibius, 404 

 italicus, Arvicola, 405 

 italicus, Arvicola terrestris, 404 

 italicus, Evotomys glareolus, 227 

 italicus, Evotomys nageri, 227 



jochelsoni, Evotomys, 241 



