LUTRA 359 



of which nearly e(]uals width of flattened interorbital region. 

 Rostrum short, broad and deep, the distance from front of 

 zygoma to gnathion barelj^ equal to greatest breadth across 

 canines, about equal to depth at front of orbit, and contained 

 about 4^ times in condylobasal length of skull. Zygoma 

 widely spreading throughout, the arch heavy, not much bowed 

 upward, the anterior root conspicuously perforated by the large 

 anteorbital foramen the upper margin with low but evident 



yiG. 74. 



Lutra lutra. Nat. size. 



angular projection marking posterior border of orbit. Palate 

 rather narrow, the distance between molars contained about 

 three times in that from gnathion to level of posterior border of 

 molar : incisive foramina moderate, about half as wide as long, 

 lying entirely between canines ; posterior extension of palate 

 about ecjual to distance between molars and about one-third that 

 from molar to hamular ; mesopterygoid space narrow anteriorly, 

 widei- posteriorly, its length about double the width between 

 haiiuilars. Auditory bulla small, flattened, though a little 



