546 GEOLOGICAL SURVEY OF THE TERRITORIES. 



MAMMALIA. 



QUADRUMANA. 



In the Proceedings of the American Philosophical Society, 1872, p. 

 554,* the writer described a species of Quadruraanous Mammal under 

 the name of Anaptomorplius cmitdus, comparing its dental and other 

 characters with those of Simla. In the American Journal of Science 

 and Arts, for ]Sroveraber,t 1872, J^rofessor O. C. Marsh announced that 

 he believed that three genera previously described by him, viz, Thino- 

 lestes, LimnotJierhim, and Telmatolestes^X were referable to the Quadrum- 

 ana, saying that they "have the principal parts of the skeleton much 

 as in some of the lemurs." Prior to either of these determinations, the 

 author described a new genus and species as allied to Notharctus, Leidy, 

 under the name of Tomitherium^W but made no suggestion as to its ordi- 

 nal position. 



On a re-examination of the last-named genus, I am satisfied that it 

 also should be referred to the Quadrumaua, and describe it as follows : 



TOMITHERIUM, Cope. 



Dental formula |y^^, in an uninterrupted series. Last molars with 

 five tubercles, others with four; all low and slightly alternating, the 

 outer wearing into crescents. Canines quite small. Incisors very 

 prominent, the median pair with transverse cutting-edges. Symphysis 

 coossified, projecting in front. In the molars, the adjacent horns of the 

 two outer crescents unite with the anterior outer turbercle ] the i)oster- 

 ior outer is insignificant. There is a projection but no tubercle in front 

 of the outer anterior turbercle. The premolars present but a single 

 compressed conic crown ; the posterior, however, widened behind, and 

 with a low turbercle. The first and second premolars are one-rooted, 

 (not entirely a generic character.) 



I base the distinction between this genus and Notharctus on the small 

 canine, and the sub-horizontal position of the incisors ; believing that 

 when other portions of the skeleton are studied, other differences will 

 appear. 



The portions of the skeleton of the type species ijreserved are : the 

 entire dentition of the lower jaw minus the crowns of the outer incisor, 

 canine, and first premolar ; the left ramus nearly complete, the extreme 

 angle being wanting ; the right humerus complete, with right ulna and 

 radius, the latter lacking the distal extremity; a lq,rge part of the left 

 ilium ; the right femur nearly entire ; part of the left humerus, meta- 

 tarsals, &c. 



The mandibular rami are quite stout, but not very deep ; the sym- 

 physeal portion long and oblique, and the coronoid and condylar por- 

 tions elevated, with axis at right angles to that of the horizontal portion. 

 The condyle is well elevated, and the coronoid process small ; the dental 

 foramen is half way between the margins of the ascending ramus, and 

 opposite the bases of the crowns of the molars. The inferior margin of 

 the jaw shows no tendency to inflection at a point immediately below 

 this foramen, where it is broken oft'. The mental foramen is divided, 

 the exits being at points opposite those between the premolars 1-2 and 

 2-3. 



* Published October 12, 1872. % Published August 7, 1872. 



t Published October 8, 1872. || Published August 7, 1872. 



