164 DE. G. ELLIOT SMITH ON THE BEAIN 



are at present concerned is even larger. The cerebral hemispheres are 66 mm. long 

 (/. e. 7 mm. longer than Dr. Forsyth Major's specimen), 53 mm. broad (4 mm. more 

 than the other), and 41 mm. deep. I have weighed a series of Lemurs' brains at 

 various times and select the following as being those of adults weighed when perfectly 

 fresh and before being put into any preservative fluid : — 



Brain-weights Body- 

 in grammes. weight. 



1. Lemur fulvus, ? . 25-8 1970 



3. „ macaco, ? 27 1 1950 



3. „ „ ? 22-0 2110 



4. „ „ S 26-0 2140 



5. „ „ S 27-4 1720 



6. „ „ c? 28-9 1390 



7. „ varius, S 39"0 2900 



Max "Weber records the following weights : — 



8. Lemur varius, S 33*0 3399 



9. „ „ ? 28-7 2152 



10. „ mongoz, ? 28-0 2128 



11. „ „ ? 21-1 1266 



The cranial capacity of the Lemur macaco whose brain weighed 26 grammes is 

 exactly two-fifths the displacement (measured with sand) of the cranial cast of Lemur 

 jullyi, so that in estimating its brain-weight as 65 grammes we cannot be far wrong. 

 Thus we find that none of the Lemurs in the above list, with the exception of two of 

 the three examples of Lemur varius, has a brain half as big as that of the extinct 

 apecies. 



For comparison I shall place side by side the measurements of the cerebral 

 hemispheres of several Lemurs in millimetres : — 



Length. Breadth. Height. 



Lemur jullyi 66 53 41 



f Lemur macaco 48 38 28 



C (Hatau and Jacobsolm's measurement.) 



Lemur macaco, ? 43 37 26 



Lemur fulvus 46 38 



Lemur varius 49 43 



(Lemur jullyi 59 48 31 



t. (Forsyth Major's specimen.) 



The features of this brain so closely conform to the same general plan as the other 

 species of this genus that the descriptions and figures of the latter (i, pp. 326 and 

 327) which I have already published apply in most respects to the brain under 

 consideration. 



