536 THE AGE OF MAMMALS 



Fam. Castoroididae. Beaver-like Rodents. 



f ('a.siurai(/(.<t. Pleist., N. Ainer. ' 

 f Amhlyrhiza. Pleist., W. Indies. 



SuPKUFAM. Geomyoidea. Pucket Gophers, Pocket Mice, Kangaroo 



Rats, etc-. 



Fam. Heteromyidae. Kangaroo Rats & Pocket Mice. 



f ^Gi/mniipti/r/ius' (= Ailj'uldumo). L. to U. Olig., X. Amer. 



f Heliscom;/s. M. Olig., N. Amer. 



Perof/nathus. Pocket Mouse. U.S.A., Mexi.(?L. Mioc, N. 

 Amer.). 



Heteromi/s. Pouched Spiny Rat & Mouse. Mexi. to Ecuador & 

 Venezuela. 



Dipodunv/s. Kangaroo Rat. U.S.A., Mexi. 



Fam. Geomyidae. Pocket Gophers. 



f Inc. sed. Protoplychus. U. Eoc, N. Amer. 



t Entoptychus. U. Olig. to L. Mioc, N. Amer. 



f PleuroUcus. U. Olig., N. Amer. 



Thomomys. Lesser Pocket Gopher. U.S.A., Mexi. (since M. 



Mioc, N". Amer.). 



Geomys. Pocket Gopher. U.S.A., Mexi. (since U. Mioc, N. Amer.)- 



(2) Section il/FOil/6»/?Pjy.4. RaUike Rodents. 



SuPERFAM. Myoidea. Rats, Jerboas, etc. 



Fam. 'Gliridae' (= iMyoxida:?). Dormice. 



Myo.rus. Squirrel-tailed & Garden Dormouse. Eur. (since U. 

 Olig.) ; S.W. As., Japan. 



Graphiurus. African Dormouse. Afr. 



Platacanthomys. Malabar Spiny Mouse. S. India, Cochinchina. 



Muscard'mus. Common Dormouse. Eur. (since Pleist.), As. Min. 



Eliomys. Lerot. Eur., N. Afr. 



Fam. Muridae. Rats, Mice, etc. 



SuBFAM. ' Cricetinse ' (= Sigmodontinse). Hamsters, Field Mice, 

 and Field Rats. 



■j- Gricelodon. L. Olig. to U. Mioc, Eur. 



f Eumys. M. to U. Olig., X. Amer. 



SuBFAM. Murinfe. Rats and Mice. 



3Iu.i. Rat, Mouse. Cosmop. (Plioc & Pleist., Eur.). 



Nesocia. Bandicoot Rat. Palestine to Java (Plioc. & Pleist., 

 India). 



Acomys. Spiny Mouse. E. Afr., As. (U. Mioc & Plioc, Eur.). 



