V 



920 THE JOHN DAY FAUNA. 



side of the crown are well developed. Dimensions half as large again as in 

 C. gregarius, as indicated by many specimens of the latter. In it the ante- 

 rior lateral tubercles are subeqnal. 



A second specimen from the same locality is a mandibular ramus, with 

 the alveoli of the entire molar series and the last premolar and sectorial 

 perfectly preserved. As compared with a larger number of specimens of 

 C. gregarius, the jaw is larger, but is chiefly distinguished by the relatively 

 stouter and broader teeth. The first premolar is one-rooted. 



Measurements. 



M. 



Length ofbaseaofcrowns of M. II and III (No. 1) 0.0095 



Length of base of crown ofM. II 0060 



Width of base of crown of M. II 0035 



Elevation of crown ofM. II — ...... .0030 



Length of bases of five anterior molars (No. 2) 0320 



Length of bases of four premolars — --• .0220 



Width of sectorial at middle 0045 



Elevation of sectorial at middle 0070 



Depth of ramus at sectorial 0130 



Thickness of ramus at sectorial 0055 



A fragment of a mandible containing the last three molars found in the 

 John Day basin of Oregon agrees in proportions with the above specimens. 



Unfortunately there is not enough material in my hands to render it 

 clear whether the specimens represent a distinct species, or a large variety 

 of the C. gregarius. For the present I retain it as distinct. 



Galecynus geismarianus Cope. 



Canis geimtariami^ Cope, Paleontological Bulletin No. 30, p. 9, Dec. 3, 1879. Proceedings American 



Philosophical Society, 1879 (1880), p. 71. 



Plates LXX, figs. 2-3 ; LXXa. 



This species was about the size of the fish^ Mustela pennantii, and was 

 larger than the G. gregarius. It is represented in my collection by the 

 greater part of a skeleton accompanied by a skull with lower jaw complete; 

 by a second skull, from which the end of the muzzle and the teeth have 

 been broken ; and by a fragment of a mandible which supports a sectorial 

 tooth. On the last specimen the species was originally founded. 



The characters of the cranium which demonstrate the distinctness of 

 the species, are (1) the low and long sagittal crest ; (2) the large size of the 



