x® MONOGRAPHS OF NORTH AMERICAN RODENTIA. 
Series IIT.—HYSTRICOMORPHA: Hysrrictve Ropenvs. 
Famity VIII.—CASTOROIDIDAE: (Fossit.) 
= Pages. 
MONOGRAPH V.—Allen =... 22. 2. eee 415-426 
Pamity IX.-—HWSTRICIDE: Spa 
MONOGRAPEL W.—Allen?: 2 ic. 22. ee ee eee 379-398 
SuBORDER DUPLICIDENTATI: LieporiInr ROopDENTs. 
Famitry X— LEPORIDAE: Hanes. 
MONOGRAPH sli—Allen. 2. 222 eee eee 265-378 
Famity XI.—LAGOMYIDAZAE: Pikas. 
MONOGRAPH VV.—Allen-. = ss. 2.2. OS eee 399-414 
