CLASSIFICATION OF THE SCIURID^. 



235 



Text-figure 2f5. 



A. Baculum of Citellus mongolicus, from below. 



B. The same from the left side. 



C. Baculum of C. leursi, from below. 

 T>. Apex of the same from the left side. 



E. Baculum of C. mexicamis, from above. 



F. The same from the left side. 



G. Baculum of C. 13-lineattis, from below. 

 H. The same from the left side. 



I. Apex of the same from above. 



K. Baculum of Cynomys hidovicianvs, from the left side. 

 L. Tl:e same from above. 



M. The same of another specimen, from below. 

 N. Baculum of Marmota marmota, from below. 

 0. The same of another specimen. 



