PLATE XV. 



Fig. Page 



1. Paloeomastodon headnelli, Andrews; left ramus of mandible, upper and 



(1 a) outer views : one-third nat. size. Fluvio-marine beds (Upper 

 Eocene). [Type specimen, C. 10014.J 150 



2. Ditto ; fragment of left maxilla with greatly worn 7n. 2 and m. 3, palatal 



view: one-third nat. size. Same horizon. [C. 10014 a.J 151 



3. Ditto ; atlas vertebra, front view : one-third nat. size. Same horizon. 



[C. 10060.] 144 



cond., surfaces for occipital condyles. 



i., socket of incisor. 

 a. 1-6, molars, 

 m./., mental foramen. 

 mx., maxilla. 

 n.c, neural canal. 

 li.sp., neural spine. 



od., socket for odontoid process. 

 pal., palate. 

 pm. 3-4, premolars. 



syni., symphysis of manGible. 

 t.p., transverse process. 

 V.C., vertebrarterial canal. 

 xyg., base of zygomatic process of maxilla. 



