146 ME. F. E. BEDDAED ON THE [Feb. 19, 



that of Gervais \ who represents the brain of this animal as 

 comparatively complicated. As I have examined two braius which 

 agree with each other, I think it may be fairly assumed that my 

 description is accurate. 



§ ^^/te i?rai?i 0/ Gralago crassicaudatus. (Fig. 4.) 



The brain of this Lemur dilfers in several particulars from the 

 brains of other Lemurs which I have examined, though it is 

 constructed upon the same general plan. The general outline 

 of the brain is much as in the genus Lemur. The fissures are, 

 on the whole, few, when the size of the brain is taken into 

 consideration, but some of them are very deeply engraved. This 

 is the case with the Sylvian and angular fissures, which are really 

 the only well-marked ones. 



Fig. 4. 



B 





-s,. 



Brain of Galago crassicaudatus. A, front, B, side ^ iew. 

 Lettering as in fig. 1. 



The Sylvian fissure is not quite so long as it is in some other 

 Lemurs. The angular fissure is not more than a quarter of an 

 inch long, but it is very deep ; it is slightly crescentic, the con- 

 cavity embracing the extremity of the Sylvian fissure. The infero- 

 frontal fissure on each side is represented by two detached 

 portions, which are very short but faii-ly deep. They are in the 

 same straight line, and the direction is obliquely inwards as in the 

 genus Lemur. There is a small dent in the brain-substance just 

 on a level with the hindermost extremity of the infero-frontal 

 sulcus, in the middle of the widest part of the sagittal gyrus, 

 which appears to correspond to a more strongly marked impression 

 that I have already referred to as existing in a similar position in 

 the genus Lemur. Below the infero-frontal sulci is a rather 

 faintly marked furrow, longitudinal in direction, which I compare 



' Loc. cit. fig. 2, pi. ii. 



