420 PEOF. G. ELLIOT SMITH OX THE 



'J'lie brain of a Lemur is relatively smaller and more macrosinatic than that of an Ape. 

 In addition, there are differences in the so-called occipital region. 



Tlic data for comparing tlie size of tlie brain in the Lemurs with other mammals are 

 unfortunately somewhat scanty, and (if we neglect the wholly unreliable figures yielded 

 by weighing organs which have been modified by the action of preservative agents) are 

 almost \vhf)lly the result of the careful investigations of Professor Max Wclier of 

 Anisterdani f. 



Tlie \vei"-hts recorded bv Weber i are as follows : — 



3 



Brain- Propniiloii to 



SpiiciKs. wi'hjht. Budy-ux'itjht. 



Leiii II r ruriiis, G coff . , (^ 3."? 1:1 0:> 



„ ? 28-7 1:75 



* „ „ „ e 39 1:74-3 



Lriii/ir iiio)ii/oz, lAnu., $ ^8 1:76 



$ 21-1 1 :60 



Nijctkcbiis lard'u/radtis, d\a\ , ^ 8'l.S 1 : (il 



„ 6 "■"•- 1 :•"'!• 



Fcro(/ic//ciis jju/to, IjCiSon !>'o 1 : 7() 



1'5-^^ 1:-- 



'■>■■>'■> l:''i 



('I//roiiii/.s i/nidiiija.scariciisis, Geoff.. ? 42''J3 1 : 37 



The record of the weight of the brain in CMj-om^s is identical with that of Oudemaus 

 (Xatuurk Verb. Kon. Akad. Amst. xxvii. 1890, p. 27). 



As tlie result of an elaborate series of investigations, Professor Eugene Dubois arrived 

 at the conclusion that " in the Lemuridse, ]S\i/cficeb!is and Tars/us occupy the sanu^ 

 dea-ree on the scale of brain development as measured by its quantity," and further tliat 

 " this is about equal to that expressed by the lower indices in the Ungulata and 

 Camivora" §. In the same place, however, it is stated that "the lower OkMA'orld 

 apes ... do not distinctly exceed in this respect the Ungulata and'Carnivora." 



In Ziehen's tables there are three records (all by Max AVeber) of brain-weights in the 

 Ilapalidaj, ranging from 9-8 grm. (1 : 20) to 12-H grm. (1 : 26) ; and three records in 

 the genus Filhecia (two by Plower and one by Weber), showing a variation of 22 grm. 

 (1 : 20) to 3G-2 grm. (1 : 15) in the brain-weight. These numliers are sufficient to show 

 how much more riclily the New-World Apes are endowed Avith brain-sul)stance Than the 

 Lemurs are. 



Duliois's statement concerning Xycticebiia and Tarsi us presumably does not ap})ly to 



t ' Vurst udii-ii iibcr das Ilirngcwioht der Siiugethierc," Leipsig, ISUli. 



t)ther records have been published by Burmeister, liischott', FLd:iu and Jacobsohii. and Ziehen, Imt the weights 

 ;ire not those of fresh brains and cannot l)e corrected with any accuracy. 



X All these weights except that marked with the asterisk (") are nuuted from Hardeleben's ' Haiidbuch der 

 Aiiatoniie des Menschen,' Nervensystem (by Prof. Ziehen), p. y<iS. 



^ •• On Piducaiithru2ii'.s ereiiiis," Proc. 4th Intern. Congr. Zoo!., Cambridge, l^li^, p. V\. 



