546 GEOLOGICAL SUKYEY OF THE TERRITORIES. 



MAMMALIA. 



QUADKUMANA. 



Tn the Proeeecliiigs of the American Pliilosopbical Society, 1872, p. 

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

 the name of Anaptomorphus wmulus, comparing' its dental and other 

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

 and Arts, for November,! 1872, Prolessor (). C. Marsh announced that 

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

 lcst£S, Limnotkerium, and Tclnmiolestes^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^ I-ieidy, 

 under the name of Tomitheriuni,\\ but made no suggestion as to its ordi- 

 nal positioji. 



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

 also should be referred to the Quadi^umana, and describe it as follows : 



TOMITHERIUM, Cope. 



Dental formula Ijjj, 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 jiair with transverse cutting-edges. Symphysis 

 coossified, i)rojecting in front. In the molars, the adjacent horns of the 

 two outer crescents unite with the anterior outer turbercle ; the poster- 

 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 firstf and second iiremolars are one-rooted, 

 (not entirelj' a generic character.) 



I base the distinction between this genus and NofJiarcfns 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 preserved 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 large 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 syin- 

 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 betw^eeu the premolars 1-2 and 

 2-3. 



* rublisbed October 12, 1872. t Publisbed August 7, 1872. 



+ Publisbed October 8, 1872. II Publisbed August 7, 1872. 



