PANTYLUS CORDATUS COPE 27 
are not distinct. In the specimen here described the teeth do not 
appear to be greatly worn and they probably never had the pointed 
apex. ‘The shanklike base is also wanting and the teeth are dis- 
tinctly acrodont. For these reasons I believe that P. coicodus and 
P. cordatus are distinct species. And, furthermore, if Cope was 
correct in his statement that P. coicodus has a partially pleurodont 
dentition, the differences seem to be greater than specific. 
The dentition would suggest peculiar food habits for the animal. 
The lack of sharp teeth certainly indicates that its food did not 
require cutting. In all probability the dental armature was an 
adaptation for the crushing of shells of gastropods and other 
molluscs. 
A COMPARISON OF MEASUREMENTS 
Described 
Type Specimen Siceinen 
Length of axis of cranium to line connecting anterior 
berderoMonbitSpe ves teres IN erates eS ae ee th aides, She 0.018 m. 0.020m 
Mmitersoritallwa thee. aaae crea ccs laces ac feet. ay: 0.032 0.040 
Longitudinal diameter of orbits...................-.- 0.016 0.021 
Bengtheiromzorbrt toymostniliy seme seas Vases dee be clo 0.015 0.018 
Height of crown of large maxillary tooth ............. 0.0045 0.003 
Width of mandibular ramus below at middle........... 0.020 0.027 
slength of part of ramusipreserved.). 250: 4.0.00--00--| 0 os ee 0.084 
Spreadvof-ramigatigreatestlengthi. -sc2240-ss-s2e-2+2-) --:2-- 0.092 
Width of cranium at line connecting posterior border of 
Guadratesiese. cry uemiantias Gey ea ube eer tain Gah, ONOT 7 loleennia 
