1894.] XATURAI. SCIENCES OF PHILAPET.PHIA. '251 



ILLUSTRATIONS. 



PLATE IX. 



(Figures natural size. ) 



Figs. 1-4, 7, 8. Hodomys alleni, 9) 44,631, jNIanzanillo, Mexico. 

 1, skull from above; 2, same from left side; 3, same from 

 below ; 4, mandible from left side ; 7, same from below ; 

 8, same from above. 

 Figs. 5, (5, 9. Xeotoma. 



5, mandible from left side ; (5, same from below ; 9, same from 

 above. 

 Figs. 10-13. Xenomy.< iieJi^oiii, $, 45,287, Hacienda INIagdaleua, 

 Colima, ^Mexico. 

 10, skull from above; 11, same from left side; 12, same from 

 below ; 13, mandible from left side. 



TEXT FIOURI-:S. 



Fig. 1, (/, b, ('. Pfy-<sophoriis ele(/aii.-< (from Ameghino). 



a, right ramus of mandible, outer side. Nat size. 



b, "■ <» (i " inner side. Enlarged. 



c, crowns of right lower molars. 



d, Sigmodon hispidiis, crowns of right lower molars. Enlarged. 



e, Hodomys alleni, a u a << << a 

 Fig. 2. Tretomys atavus, left upper molars enlarged (from 



(Ameghino). 

 Fig. 3, (( and b, IIodomy.-< alleni. 



((, crowns of left upper molars, (x 5.) 



b, " " " lower molars. 

 (' and (/. Hodomys vettdus. 



c, crowns of left upper molars, (x 5. ) 



d, " " " lower molars. 

 e and /. Xenomys nelsoni. 



e, crowns of left upper molars, (x 5.) 

 /, " " " lower molars. 



Fig. 4. Xe)iomy.-< iielsoni. Type No. i|=^', S , ad. 

 Hacienda Magdalena, Colima, Mexico. 



a, upper molar series, (x 7.) 



b, lower molar series. 



