8 



PROCEEDINGS OF THE NATIONAL MV8EVM. 



VOL. 45. 



situated under the posterior root of the zygomatic process of the 

 squamosal, and is moderately large. Just within its orifice may be 

 seen the tympanic ring. 



The mandible shows no points of special interest. In comparison 

 with the Macroscelididse the coronoid process is well developed and 

 stands about as high above the condyle, as the condyle does above 

 the angular process. In the Macroscelididse the condyle is drawn 

 upward as high as the coronoid. Ptilocercus has a relatively wider 

 and larger coronoid than the other genera of the Tupaiidse. A well 

 marked mental foramen is found under the first or second premolars, 



/lOchUfrnQ/ Jar. 



i^emexilli 



-Jin/erfiarie/af 



JnftrflC 



Fig. 1.— Diagram showing the forms and relationships of the 

 individual bones of the skull of tupaia as determined by 

 examination of young indmduals. 



but in Ptilocercus the foramen is usually not single and situated 

 slightly more posteriorly. 



The relative position and shape of the more important bones of the 

 skull as shown by examination of immature specimens may be seen 

 in figure 1. 



Auditory ossicles. — "In the Tupaiidse the malleus assumes to an 

 extreme degree ths neckless and nonlaminated type common in most 

 Cebidas and some lemurs, as well as in Sciurus; but the manubrium 

 is rather of the form prevailing in the above-named primates than 



