ee ees. ee LE oda A 
1884.] The Amblypoda. 1195 
The general relation of the teeth-of these genera to those of 
other families of the order has been discussed (supra p. 1117). 
Their relation to each other may be understood by comparison of 
Fig. 9a and f with Fig. 16. In the latter the anterior external V 
is marked a, and the posterior p. The posterior exterior angle of 
the latter is designated by the letter e. In Manteodon (Fig. 9 f) 
the posterior external V is observed to be well developed on the 
last superior molar. In Ectacodon (Fig. 16a) its posterior edge 
is represented by an external cusp only (e), the rest of the border 
) ae 
i AE 
\ 
= ¥ 
ee 1d Bath modon ach Cope, bones of fore limb, one-fifth nat. size, from 
Wasatch beds of Wan s Se T left humerus from behind ; a’, proximal, - ’, 
“tal views, Fig. 4, left radius from behind; 4’, proximal, 6/7, distal views; ¢, 
Pisiform bone. From Vol. 11 Report U. S. Geol, Survey, F. V. Hayden. 
_ being absent. In Coryphodon this border is sometimes trace- 
e (C. anax, Fig. ọ a) or is wanting. In Metalophodon it is 
ĉntirely absent, and is represented by a conical projection of the 
Posterior crest only (Fig. 16 p). The posterior V of the second 
“tperior molar is distinct in all except Metalophodon (Fig. 16 
bp), where it is represented by a crest only, as in the last molar 
most of the species of Coryphodon. The succession 1S thus 
en to consist of the gradual conversion of the external Vs into 
