190 



THE MERYCOIDODONTID.-E 



Ticholeptus breviceps Douglass 1907 

 Fig. 139j PI. XXVIII, figs. 3-5 



Original Reference: Some new merycoidodonts. Ann. Carnegie Mus., IV, pp. 107-108, pi. 29. 



Type Locality: About one mile southeast of YVoodin, Divide Creek, north of Melrose, and six or seven 

 miles south of the Continental Divide, Silver Bow County, Montana. 



Geologic Horizon: Upper Miocene (Flint Creek). The type was found "enclosed in a nodular mass in 

 deposits composed of gravel and cream-colored sands." 



Type: Holotype, Cat. No. 1191 CM., "consists of a skull, mandible, left humerus, left radius and ulna, right 

 radius and part of the right humerus, a tibia, a fibula, a tarsus with two metatarsals, greater portions of the pelvis, 

 and the right manus with several metacarpals and phalanges." Collected by Earl Douglass in 1903. Specific 

 name given on account of the shortness of the skull. 



Specific Characters: The skull is short and broad, with the facial part rather deep and the 

 superior contour nearly straight. The anterior nasal border rises steeply above P 1 , and the premaxil- 

 laries are coossified for a distance of 1.4 cm. The zygomata are well expanded, with the maximum 

 just in advance of the glenoid surface. The malar part is deep below the orbit, and the squamosal 



Fig. 139. — Ticholeftus brevlcep Douglass. Skull and jaw. HT. 



(After Douglass, 1907.) 



Cat. No. 1191 CM. 1/2 nat. size. 



section, relatively heavier than usual in this genus, is short and rises abruptly posteriorly in a thin 

 edge. The facial vacuities are large, with their longer diameter, twice that of the shorter, extending 

 upward and forward. The nasals are short, nearly straight anteroposteriorly, and convex trans- 

 versely. The facial part of the lacrimal is very small, owing to the great encroachment upon it of 

 the facial vacuity. There is a trace of a deep lacrimal fossa. The frontals are wide and nearly flat, 

 except for the convexity over the orbits. They extend in advance of the lacrimals, apparently to the 

 anterior border of the facial vacuities. The orbits are relatively large, and they are round and closed 

 by a stout postorbital bar. They are located slightly above the center vertically. The temporal 

 ridges join in a plane above the glenoid surfaces to form a short sagittal crest. The supraoccipital 

 crest is broken away, but, judging from what evidence there is, this crest did not overhang beyond 



