1879.] 



MR. GARROD ON THE ANATOMY OF HELICITIS. 



307 



border of the temporal lobe (J). The crucial fissure is long and 

 oblique, and situated further back than usual." In the footnote (J) 

 we read, " Except in the smaller numbers of the genus Mustela, 

 where the sulcus separating the superior from the middle gyrus is 

 less produced posteriori}' than in others of the group. In Galictis 

 vittata, however, the brain is quite a miniature of that of a Bear ; 

 but the middle convolution is united with the upper one at its 

 superior anterior angle. 



Fig. 1. 



Brain of Helictis subauraniiaca ; superior aspect. 



Brain of Helictis subaurantaica ; lateral aspect. 



Tn Helictis, as also in Ictonyx sorilla, the superior gyrus ceases 

 at the superior posterior angle of the hemisphere, as in Mustela. 

 The anterior limb of the inferior gyrus is extremely narrow, espe- 

 cially near its upper end, where it becomes almost hidden by the 

 corresponding part of the posterior limb of the same gyrus. A 

 small sulcus tends to divide the transverse part of the middle gyrus 

 from its posterior limb. 



Most peculiarly, in Helictis there is no crucial fissure, because the 

 hippocampal gyrus appears upon the superior aspect of the brain. 

 This is the case in no other carnivorous animal with which I am 

 acquainted, but occurs in Moschus, Cervus pudu, and other smaller 

 Rumiuantia. 



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