88 PROF. G. ELLIOT SMITH 03i 



in the figure. The upper end of the suprasylvian sulcus is also 

 disposed like that of the leit hemisphere in Mem. fig. 1 ; the 

 upper end of the postsylvian sulcus is bent forward, very slightly 

 on the right hemisphere, but more decidedly on the left side 

 (compare Mem. fig. 7). The lower end of the suprasylvian 

 sulcus is exposed on the surface to an exceptionally great extent. 



Kg. 4 of the memoir accurately represents the basal surface of 

 this specimen in all except three points : the rhinal fissure (/r.) is 

 incomplete, the diagonal sulci {sd.) do not extend to the margins 

 of the orbital surfaces, and the lower end of the suprasylvian 

 sulcus (i. e. its exposed part) is distinctly visible. 



The mesial surface of each hemisphere is exactly like that 

 represented in fig. 5 of the memoir in every respect, except that 

 there is no genual sulcus (sy.) and the intercalary sulcus is 

 shorter, i. e. does not extend backward so far. 



General Considerations. 



In the memoir on the Prosimian brain I disclaimed any pre- 

 tension to settle the question as to the relationship of the 

 Lemurs to the Apes and other Mammalia, and merely attempted 

 to state in decided and unequivocal language the nature and 

 value of the evidence of cerebral anatomy concerning the vexed 

 question of kinship. No problem as to the closeness of the 

 bonds of afiinity wliich link together various mammalian families 

 can be adequately decided on the evidence of one region of the 

 body alone, even though this be so important and representative 

 an organ as the brain. 



I return to this aspect of the subject only because I was 

 ignorant of the above quoted memoirs of Hubrecht and Earle 

 when my memoir was written. 



The aim of Hubrecht's researches is chiefly to demonstrate 

 the intimate relationship of Tarsius to the Apes, and the wide 

 gap which separates it from the Lemurs. In his own words : — 

 " Tarsius is not a Lemur at all, ... it should never have been 

 placed alongside the Lemurs, ... its position is somewhere between 

 an unknown type of Insectivores and our modern monkeys and 

 Man" {op. cit. p. 16). 



These views are based chiefly on the evidence of placental 

 anatomy, the validity of which Sir William Turner long ago 

 refused to acknowledge, in view of the fact that the testimony of 

 the teeth, the skeleton, the unguiculate digits, the calcariue 



