NERVOUS SYSTEM. VERTEBRATA. 281 



Bears that I shall distinguish it as " ursine." In the brains 

 of all other Bears that I have examined it is independent 

 of the calcarine sulcus, but in some cases it joins the rhinal 

 fissure. 



There are typical genual and rostral sulci. The posterior 

 extremity of the genual sulcus (in this specimen, fig. 156) 

 is joined to a very constant vertical sulcus which bisects 



Fig. 157. (xf.) 



-SULC.PARACAUD. 



the "Ursine lozenge" (fig. 155). As reference will be 

 made to this in speaking of the Seals, it may be distinguished 

 as the " bisector sulcus/' 



There is a shallow sulcus midway between the calcarine- 

 intercalary complex (splenial) . It is the " sublimbic " of 

 Guldberg. 



The typical characters of many other parts of the brain, 

 such as the hippocampus, the cerebral commissures, the 

 pyriform lobe, and especially the cerebellum, are exceed- 

 ingly well-shown here. These features are remarkably 



