EXPLANATION OF PLATES. 

 (all natural size.) 



Plate XIX. — Skull of Aplodontia major & ad., No. 2101 

 Mus. C. H. M. 

 a. cranium from above ; b. cranium from below ; c. man- 

 dible from below. 



Drawn by Ernest E. T. Seton. 



Plate XX. — Comparative view of Skulls of Aplodontia 



MAJOR AND APLODONTIA RLFA. 



a. & b. A. major $ ad., No. 2106 Mus. C. H. M. a. from 



above ; b. occipital plane. 

 c. & d. A. rufa $ ad., No. 22205 IT. S. Nat. Mus. c. from 



above ; d. occipital plane. 



a. & c. drawn by Miss Villette Anderson ; b. & d. by Dr. Geo. Marx. 



Figure 1, page 327, Skull of Aplodoxtia major ? ad. No. 

 2lu7 Mus. C. H. M. Showing persistent fronto-premax- 



illary suture. 



Drawn by Miss Lillie Sullivan. 



