66 ROY L. MOODIE 
skull. They inclose between them in the median suture the small 
pineal foramen. They are acuminate in front with a broad truncate 
posterior base where they are bounded by the supraoccipitals. The 
supraoccipital is nearly square, being somewhat wider than long. It 
joins the epiotic and the parietal. The epiotic is elongate in the 
longitudinal diameter of the skull. It ends anteriorly in a point 
which is inserted between the postorbital and the parietal. The 
epiotic bears a short protuberance posteriorly much as does the same 
element in the type species. There are four elements which take 
part in the formation of the posterior border of the skull. These are: 
the supraoccipital, the epiotic, the squamosal and the supratemporal. 
It is very unusual for the squamosal to reach the posterior edge of the 
cranium. ‘The prefrontal les anterior to the orbit of which it forms 
the anterior border. It has the usual relations. The lachrymal has 
not been detected although Jaekel’ has identified it in his drawing of 
the skull of the type species. The maxilla is elongate and forms the 
lateral border of the skull. No teeth have been detected although they 
were doubtless the same as Jaekel has figured in D. punctolineatus 
Cope. The jugal is an elongate element joining the maxilla posteri- 
orly. Jaekel included this element in his ‘“perisquamosal” but the 
sutures are clearly evident in this specimen and no ‘“‘ perisquamosal”’ 
has been identified. ‘The postorbital is fully as large as the jugal 
which it joins. It forms a part of the posterior border of the orbit and 
it ends posteriorly in a point which is inclosed by the epiotic and the 
squamosal. ‘The postfrontal with the foregoing element forms the 
entire posterior border of the orbit and it likewise ends in a point 
inclosed by the parietal and the postorbital. The quadratojugal has 
much the same shape and relations as in D. punctolineatus Cope, 
although it is located farther back. ‘The squamosal is also elongate 
as are most of the posterior cranial elements and it likewise has an 
acumination which is directed forward and is inclosed by the post- 
orbital and the jugal. The squamosal abuts onto the posterior 
border of the skull. The anterior suture of the supratemporal ele- 
ment is rather indistinct but it is, I believe, as represented. ‘The 
element is elongate and is prolonged posteriorly to form the horn, 
which ends in a blunt point and is not sharp as in the type species. 
t Op. cit. 
