NERVOUS SYSTEM. VERTEBRATA. 



291 



the olfactory peduncle ; but it is placed in front of the 

 olfactory sulcus, which does not extend the whole length of 

 the peduncle. 



There is a large crucial sulcus, as in Otaria, but it is 

 placed on the anterior rather than the dorsal surface. It 



Fig. 166. (xf.) 



SULC.CRU. 



SULC.P.SYL:- 



SULC.P. LAT 



SULC.PRECRU, 



SULC.BISEC. 



SULC.ORB. 



SULC. URS. 



Fig. 167. (xf.) 



SULC.INTERCAL. 



SULC. GEN.'"" 



,SULC. ENTOLAT. 



- SULC.P.CALC. 



f "-SULC.CALC. 



KIP. F. 



joins the intercalary sulcus on the mesial surface (fig. 167). 

 There is a large and very deep precrucial sulcus freely 

 opening into the crucial. And the " Ursine lozenge " is 

 bisected as it is in Otaria and the Bears. 



u2 



