1897.] 



ANATOMY OF A MANATEE. 



53 



conspicuously, exist to mark off the temporal lobe posteriorly. In 

 M. latirostris, on the other hand, the Sylvian fissure is plaiuly seen 

 to be continuous with a V-shaped rhinal fissure separa'iug off the 

 pallium, tlie wedge-shaped tract of brain (very elephantine I), thus 



Brain of Mmiatus immiguis. Tbe upper figure represents the dorsal 

 aspect, the lower a lateral view. 



S, Sylvian fissure. 



exposed when the organ is viewed laterally, being itself divided 

 by a continuation of the Sylvian fissure. On the upper surface 

 of the brain, moreover, there is, as indicated in Murie's figure, a 

 short transverse furrow not present in M. immguis. 



