PANTYLUS CORDATUS COPE 
MAURICE G. MEHL 
The University of Chicago 
E. C. Case, in his recently published revision of the Cotylosauria 
ot North America, has given to the genus Pantylus Cope the rank 
of a suborder, the Pantylosauria. Nothing is known of the genus 
aside from the skull and even that is more or less incomplete in the 
two hitherto known specimens. Pantylus is peculiar in so many 
respects that any new facts concerning it are of interest. It is for 
this reason that the writer here describes another specimen which, 
though incomplete, adds some additional facts of importance espe- 
cially as regards the dentition. 
The specimen herein described was collected by Mr. P. C. Miller, 
of the University of Chicago expedition of 1908, from the Lower or 
Wichita division of the Red Beds of Baylor County, Texas, near 
the Big Wichita River. It consists of the anterior part of the crani- 
um, as in the type, the anterior part of the left mandibular ramus, 
and a nearly complete right ramus. Unfortunately the posterior 
part of the skull is missing, but it is fairly complete from a point 
a short distance back of the posterior border of the orbits to the 
muzzle. A little of the posterior end of the right ramus is missing, 
but nearly the entire length is represented and the dentition is 
complete. 
As shown in the appended table of comparison, the specimen is 
somewhat larger than the type. Although the posterior part of 
the skull is missing, its width must have been greater than the 
type, for the spread of the mandibular ramiis at leastg92 mm. Fig. 
tb shows the anterior part of the cranium with most of the sutures 
indicated. Those between the premaxillaries, maxillaries, lachry- 
mals, nasals, and parietals are distinct. 
There is no trace of the sutures between the postfrontals and the 
prefrontals. In fact, there are but slight traces of the suture 
between the frontals and prefrontals, and this suture, with that 
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