930 THE JOHN DAY FAUNA. 



Galecynus latidens Cope. 



Bulletiu U. S. Geol. Survey Terrs., VI, p. 181, Feb. 11, 1881. 

 Plate LXX; figs. 4,5. 



The specimens which represent this species are the following: (1) A 

 skull distorted by pressure and lacking the j^ortion in front of the sectorial 

 teeth, accompanied by a mandibular ramus anterior to the base of the coro- 

 noid process; (2) a mandibular ramus similar to that of No. 1; Nos. 3, 4, 

 and 6, fragments of mandibles supporting sectorial teeth. 



The specimens show that the Galecynus latidens was intermediate in 

 size between the G. gregarius and the G. geismarianus, and diflfered from both 

 in various respects. The crushed condition of the cranium renders the 

 description of the form of the brain-case difficult. The lateral occipital crests 

 are more produced posteriorly than in the allied species. The paroccipital 

 process is much as in G. geismarianus, but is more closely appressed at the 

 base to the otic bulla than in it. The apical portion is free from the bulla, 

 and is directed principally downwards. The bullae are quite large, and are 

 oblique ovals, as wide as deep. The masseteric face of the proximal part of 

 the malar bone is lateral, and extends above the middle of the same. The 

 lachrymal bone is wider above than in most Canidce, but is not so wide as 

 in G. geismarianus. 



The sectorial molar is short, and its internal tubercle is well developed. 

 The tuberculars are distinguished for their anteroposterior width, both being 

 as wide near their inner as at their external borders. Their external cin- 

 gula are well developed ; their external crests are rather low. They have 

 a median V-shaped ridge, and a wide internal cingulum. There is a short 

 posterior cingulum on the second tubercular. 



The mandibular ramus is compressed and rather deep. The teeth are 

 not spaced, and the fourth premolar is obliquely placed, so as to overlap 

 externally the anterior lobe of the sectorial. Both the third and fourth 

 premolars have a well-developed posterior marginal lobe; the second pre- 

 molar is lost from all the specimens. The third premolar is moderately 

 compressed, but the fourth is more robust in its proportions than in any 

 other species of the genus. Both premolars have an anterior and a poste- 

 rior heel, the former minute. The sectorial is distinguished by the relative 



