Cope.] 4<JO i |.-, ,b i; 



Ursua, Arctotherium and Hymnodon ; postglenoid, mastoid and post- 

 parietal. 

 Enhydrocyon and Temnocyon ; postglenoid and postparietal only. 



Fig. -. — Temnocyon corirphceus Cope, Lower Miocene of Oregon; one-half natu- 

 ral size. PI', postparietal foramen. 



Archcelurus, Dinictis, Pogonodon, Iloplophoneus and Machwrodm (cere- 

 oralis) ; postglenoid and postparietal only. 

 Procyon, Nasua and Bassaris; postglenoid only. 

 Ganis, Vulpes and Tfrocyon; postglenoid only. 

 Viverra, Mustela, Puiorius and Mephitis; postglenoid only. 

 Felis (domestica) ; sometimes a minute postglenoid only; sometimes none. 

 Ilymna, TJncia, Cynmlurus ; no foramina. 



Prosimi^e. 

 Lemur, Chirogaleus and Tarsius ; a postglenoid only. 



QUADRUMANA. 



Hapale ; postglenoid and postsquamosal. 



Cebus ; postglenoid and postparietal. The latter is on the suture of the 

 parietal and squamosal bones ; in Hapale penicillata it is entirely within 

 the squamosal bones. 



Ateles, Callithrix, Mycetes, Semnopithecus and Gynoeephaltcs ; no for- 

 amina. 



Macacus ; a small postglenoid. 



Troglodytes niger, gorilla ; a closed fissure, but no foramen postglenoid- 

 eum. 



Homo ; no foramina in sixteen North American Indians examined of the 

 Klamath, Bannock, Crow, Sioux and Cheyenne tribes. One postglenoid on 

 one side in a South Australian. One or two mastoids are more usual, be- 

 ing found in a good many specimens of all races. They are rarest in Hot- 

 tentot negroes. 



Cetacea. 



Balccna, Beluga&nd Monodon; no foramina. 



SlRENIA. 



Halieore and Manatus ; a huge mastoid only. 



