GEOLOGICAL SURVEY OF THE TERRITORIES. 549 



:N'otharctus longicaudus, Cope. 



Pantokstes lon^icaudus, Cope. Proceed. Anier. Philos. Soc., 1872, p. 467, (Auirust 3.) 



This form is one of those mixed types which are so abundant in the 

 Bndo-er Group. Its dental formula is M. 3, P. M. 4, c. 1, incisors uu- 

 Jjuowu. The molars m the only specimen known are so worn as to 7)re- 

 clude exact description. They evidently possessed anterior and posterior 

 lobes, separated by a valley, which was most expanded on the inner side 

 1 he last molar exhibits a short heel posteriorly, which probably sud- 

 ported a small tubercle. The three premolars are all two-rooted and 

 compressed m form. The last presents a crown composed of one lar'^e 

 anterior compressed cusp, and a much lower posterior one. There is%i 

 sbo-ht. cmgulum in front. The canine is lost, but its alveolus indicates 

 that it was a stout tooth. 



So far as the laiown dental structure goes, this species resembles nearly 

 tht'\otharcius of Leidy, but possesses a more carnassial fourth premolar. 



Ihemaudibular ramus is quite slender, and there is a large foramen 

 beiow the hrst true mo!ar. The masseteric fossa is pronounced. 



I originally assigned b-it 3 P. M. to this species, but now find that it 

 possesses four, thus resen.bliug Notharctus. It differs from all the 

 species described by Marsh, in having the second premolar two-rooted, 

 and trom Leidy's two species in its slender proportions 



lie remains of this species were found together by the writer in the 

 Bndger beds on Black's Fork, Wyoming. 



ANAPTOMOEPHUS, Cope. 



Proceedings of the American Philosophical Society, 1872, p. 554, published by the 



author October 12. 



This genius is represented by the left ramus mandibuli of a single 

 species. The po,sterior portion is broken away, and the teeth remain' o^ 

 per ect are the P. M. 2, and M. 1 and 2. The ramus, though small is 

 btout, and deeper at the symphysis tlian at the last molar. What ap- 

 pears to be the (kmtal foramen is nearly opposite the bases of the crowns 

 ot the molars. The mental foramen issues beneatli the first premohir. 

 Tf r'ii'^'^'^" ^^ the ramus mandibuli, In. 2, C. 1, P. M. 2, M. 3, tot^il, 16 

 It ditters liom monkeys in some respects; there is no interruption in the 

 S^d' ""vl H "" Tl"''i' """'^ ^¥ «.vmphysis, though massive, is not coos- 

 h f.ni aV;^ ■ '^''^•'''•^^. '*''^' *'^^ ^'^'"^ "^«^'^^^ ^s three-lobed and elongated 

 bchii d Ihe C|)mposition of the crowns of the preceding molars consists 

 o lour opposed lobes, which are very stout, and connected transveiNoly 

 lKt^^'^ ! f ''^'"'^' T'"" close contact in front. The premolar tooth 

 v,h\Qh IS best preserved, IS a perfect second, which, while having two 

 roots, possesses a crown which stands almost entirely on the anterior 

 presenting a curved sectorial crest forward and upward. ' 



f^.t^Ll I'T IS more typically quadrumanous in this genus than in 

 the Jast, and It might be referred decidedly to LcmurUhc were it not for 

 fnn./i,"'?^' i- symphysis. It no doubt represents a distinct group or 

 lamlI^^ from Tomithermm, and one more nearly related to the exis iug 

 types of Madagascar and South Africa. *" 



Anaptomorphus ^emulus, Cope, loc. cit. 



PHM 11^1 n?fr' 7''?, ''^""''^ '• •' !'''^-'^ ''^^ -^ marmoset or a red squirrel. The 

 enamel of the teeth is entirely smooth. 



