1884.] The Amblypoda. 1201 
ers, but not restricted to any particular class of food. They were 
doubtless, to a large extent, like the hogs, omnivorous. 
Fourteen species of this genus have been described. They 
range in size from the dimensions of a tapir to those of an ox. 
In the absence of the bones of the skeleton the species may be 
distinguished by the inferior true molars, which are fortunately 
the parts most frequently preserved. The simplest form is that 
_ where the posterior crest of the posterior true molar is transverse, 
and there is no crest or cusp accessory to it on the inner edge of 
the crown, as in C. /atidens (Fig. 22). A change in the form of 
this crest is seen in the C. curvicristis, where it is curved forwards 
at the inner extremity so as to enclose a crescent-shaped valley. 
This species adds several other peculiarities of this tooth, as the 
presence of two oblique crests in front of the anterior cross-crest 
(Fig. 22). The superior incisors are angulate on the external 
ce. The species was of about the same size as the C. /atidens. 
: Fig, 
half nat- 
 22.— Coryphodon curvicristis — 
‘Mal size, from the Wasatch bed of Wyoming. From Report V. >. Ga bopi 
Terrs, It. Origin Fig. a, righ andibular ramus with true ert 
» from above. F ig. 5, penultimate superior lar below 5 
ao vee rown 
. . A z é i canine, C 
: rom below ; ¢, superior incisors, external side iS TE e 
> £ A, inferior incisors, external views; 2, inferior canine, Dase 
_ The posterior cross-crest may send off the internal marginal 
Ae at an angle, as in C. eocænus Ow., or C. obliquus Cope. The 
oa marginal crest may rise into a low tubercle, as in C. loba- 
MS or C. anax (Fig. 23 and 94d). In this case the PrE 
o ie may be very oblique, as in C. anar, thus giving i 
_ “PPearance of a heel or fifth lobe to the crown. This is indee 
“e character of such a crown, which if compared with that of 
"eC. latidens only might suggest generic separation, but we 
