'j6 Journal of Comparative Neurology. 



supersylvian is four times as great or i6 millimeters. There is 

 no sign of disconnection between either the supersylvian and 

 the postsupersylvian, or the supersylvian and the presupersyl- 

 vian. The supersylvian forks or sends out a branch cephalad 

 connecting with the ansate fissure exactly as in Phoca. 



The lateral fissure is relatively to the length of the cere- 

 brum shorter than in any other forms. Its cephalic end and its 

 relation to the ansate is again exactly the same as in Phoca. On 

 the left hemicerebrum the lateral is disconnected at a little 

 more than half of its length, by a narrow isthmus. 



The coronal fissure corresponds with that of Phoca, con- 

 necting, superficially at least, with the ansate and thus indirectly 

 with the cephalic branch of the supersylvian and the lateral. 



The ansate fissure, as has already been intimated, like that 

 of Phoca is irregular in its form and connects with the fissures 

 above mentioned. 



The ectolateral fissure is quite well down toward the ven- 

 tral portion of the cerebrum and as in CallorJiimis appears upon 

 the ventral aspect. 



The medilateral fissure is scarcely perceptible on the lateral 

 aspect ; it lies exactly along the caudal margin of the hemicere- 

 brum as in CallorJiimis and is better seen in a mesal view. 



The cruciate accords, in position and relation, more closely 

 with the conditions found in the bear and CallorJmius; but while 

 it reaches to the mesal surface of the hemicerebrum it does not 

 cut it as far as in the bear and Phoca. 



The precruciate and the postcruciate fissures are likewise 

 present and have exactly the same relations as in the bear and 

 CallorJiimis. 



Mesal Aspect. The callosal fissure is well developed. On 

 the right hemicerebrum it does not continue around the genu 

 as in the left. 



The splenial fissure docs not extend as far cephalad as in 

 CallorJiimis, nor as far dorsad as in PJioca. It is situated more 

 closely to the splenial half of the callosum than in either of 

 the preceding or in the bear. A branch is given off in the 

 region of the splenium proper which seems comparable to the 



