156 



GREGORY: NOTHARCTUS, AN AMERICAN EOCENE PRIMATE 



The lacrymal of Notharctus very nearly resembles that of Adapis, especially Adapts magnus, as 

 described by Stehlin (1912, pp. 1251, 1252). In that form, however, the malar was solidly in contact 

 with the lacrymal, but in the specimen of Adapis parisiensis described by Forsyth Major (1901, pp. 134- 

 135) the malar was separated from the lacrymal by a narrow strip of the maxillary. In the same speci- 



Adapm luaqiius: Aitcr Forsyth 



Fig. 51. Skull of Xufhnrctus t,ii<hmviis (?). ' 

 Yale University No. ll'lol. [Middle Eocene 

 (Lower Bridger), Wyoming. Right and left sides. 

 X 1. 



The right side shows the lacrymal protuberance, the 

 lacrymal foramen just in front of the orbit and the contact or p. Part of facial re ion Xotharcius vcnticolus 



close proximity of the malar and the lacrymal. The left side 'g- '"^^ o acia legion, j o arc us icniou. 



shows the lacrymal protuberance. " , Amer. Mus. No. 14(m«1. Lower Eocene (Lost Cabin), 



Wyoming. X 1. 



Shows the region of the fronto-iacrymal and fronto-maxillary 

 contacts. 



men the foramen is a little further forward than in Xotharctus tenebrosus, since it sharply notches the 

 maxilla. In Adapis magnus, on the other hand, the foramen was chiefly surrounded by the lacrymal 

 and malar. Thus the whole lacrymal region of Adapis, with all its contacts, differs only in minor details 

 from that of Notharctus. (Fig. 53). 



Malars 

 Text Figs. 49, 58 



This element in Notharctus is not nearly so wide below the orbits as it is in Adapis, and it was nar- 

 rower in the early species of Pelycodus. The postorbital process was not as heavy as in Adapis. The 

 orbital rim of the malar is sometimes pierced by a foramen as it is in Adapis {N. venticolus, Amer. Mus. 

 No. 11465). The outer suture between the malar and the zygomatic process of the maxilla, as well 



