96 THE LOW ER PRIMATES 



frontal pole and passing backward into a short stubby olfactory tract which 

 terminates in a prc^ninent tubercukini ollactorium. This protraction of the 

 bulb is not found in lemurs. The tLibercuhim is embraced by the olfactory 



OLFACTORY 

 NRR,Vg 



HIG. 46. BASE OF BRAIN, TARSIUS SPECTRUM. 



[Actual Length, 2i mni.| 



Striae and bounded posteriorly by a well-defined perforated space and diag- 

 onal band of Broca. The two olfactory bulbs and tracts together constitute 

 a most pronounced intcrorbital keel. 



The olfactory bulb is further identified in tarsius by its connection with 

 the olfactory portion of the nasal mucosa through a single olfactory nerve. 

 The lila olfactoria, undoubtedly because of the large size of the orbits, have 

 coalesced to form a single strand, although near the entrance into the olfac- 

 tory bulb there is some evidence of the spreading-out characteristic of other 

 primates. 



