MARTKS 369 



sagittal crest moderately developed in old individuals and slightly 

 overhanging occiput. Floor of brain-case with no special 

 features ; a slightly developed median ridge. Auditory bullae 

 moderately inflated, the surface smooth, the general outline 

 broadly flask-shaped (longitudinal diameter greatest), the meatal 

 tube well defined, rather wider than long ; space between bullae 

 about equal to diameter of bulla without tubular portion. 

 Postorbital region rather abruptly constricted, much as in 

 Mustela, its width about half that of brain-case. Interorbital 



Fia. 78. 

 Marten martes. Nat. size. 



region wider than rostrum, the discrepancy in breadth greater 

 than in Mustela erminea. Postorbital processes well developed 

 though short. Rostrum relatively longer than in Mustela 

 erminea or M. putorius, the distance from orbit to gnathion about 

 equal to width between outer margins of anteorbital foramina, 

 the width across canines much less than distance from foramen 

 to gnathion. Orifice of anteorbital foramen over anterior root of 

 carnassial, and under anterior border of rather large orbit. 

 Zygamata rather widely but gradually spreading, strongly bowed 



2 B 



