PLATE XV. 
Pig. Pag(? 
1. Palwomastodon headnelli, Andrews; left ramus of mandible, upper and 
(1 a) outer views : one-third nat. size. Fluvio-marine beds (Upper 
Eocene). specimen, C. 10014.] 150 
'1. Ditto ; fragment of left maxilla with greatly worn m. 2 and m. 3, palatal 
A’iew ; one-third nat. size. Same horizon. [C. 10014 a.] 151 
3. Ditto ; atlas vertebra, front view : one-third nat. size. Same horizon. 
[C. 10060.] 141 
lond., surfaces for occipital condyles. 
i., socket of incisor. 
VI. l-o, mola.rs. 
vi.f., mental foramen. 
vix., maxilla. 
n.v., neural canal. 
ii.sjK, neural spine. 
0(1., socket for odontoid j)rocess. 
j>al., palate. 
^urt.tf- 4 , premolars. 
si/M., symphysis of mandible. 
I.p., lrans\'erse process. 
V.C., vertebrarterial canal. 
zif(j., base of zygomalic process of maxilla. 
