16S Wortman — Studies of Eocene Mammalia in the 



arrangement to that seen in Lemur and Propithectis, for the 

 reason that the blood is delivered more directly to that part of 

 tlu i brain which it is intended to supply. 



The following variations in the position of the external 

 opening of the canal may be noted : In Tarsius, figure 103, it 

 is placed a little anterior to the external auditory meatus and 



Figure 102.— View of the base of the skull of Galago Monteiri. 



apf, anterior palatine foramen ; ppf, posterior palatine foramina ; fo, fora- 

 men ovale; flm or cc, foramen lacerurn medium or carotid canal; pgf, post- 

 glenoid foramen ; earn, external auditory meatus ; smf, stylomastoid foramen; 

 flp, foramen lacerurn posticuin ; c/, condyloid foramen. 



rather to the outer than to the- inner side of the bulla ; in 

 Uapale it is opposite the middle of the external auditory 

 meatus upon the inner side of the bulla; in the Cebidae, figure 

 104, it is yet more internal and somewhat more posterior ;* and 



* In Hapalc and Nyctipithecus an interesting variation occurs. The main 

 artery pierces the bulla in its usual position, but it apparently gives off a 

 considerable branch, which enters the cranial chamber through a canal 

 between the bulla and the basioccipital. This results in an arrangement 

 similar to that found in Lemur and Propithecus, except that the position of 

 the main branch is reversed. 



