Herrick, Brahi of Certain Reptiles. yy 



that which has to do with the memory and evolution of olfac- 

 tory sensations (For particulars see Anatomischer Anzeiger, 

 1893, 10.) 



I present not only the preparations from the dog operated 

 on by Goltz but also a series from a normal dog and finally a 

 number of sections of the brain of the giant turtle, Chelone 

 inidas, which clearly show the connection of the oldest cortex 

 with the olfactory lobes. 



CONTRIBUTIONS TO THE COMPARATIVE MOR- 

 PHOLOGY OF THE CENTRAL NERVOUS SYS- 

 TEM. 



II. — Topography and Histology of the Brain of Certain Reptiles. 



(Continued from Vol. I. p. 37.) 



By C. L. Herrick. 



Additional remarks upon the ceyebriun. The olfactory tuber 

 is large in nearly all reptiles. In some cases, as we have shown 

 elsewhere, the tuber is carried forward by the growth of the 

 skull and separated from the cerebrum, as in fishes. This is 

 true in the alligator, giving rise to the mistaken idea that the 

 peduncles are the olfaclory nerves ( Rabl-Riickard and Wieder- 

 sheim). In serpents the tuber retains its direct connection with 

 the hemisphere but it is greatly expanded, with a laterally di - 

 vergent terminal bulb. The ventricle extends nearly to the 

 end. It would appear that there are two distinct portions of 

 the pero. The longitudinal sections of black snake brain ( Plate 

 VII., Figs. 1-3.) show that at the very tip there is a mass of is- 

 olated pero which is the source of the olfactory nerve proper, 

 while the nerve to the large Jacobson's organ is derived from 

 fibres from the mesal olfactory fossa. The real configuration of 

 the tuber is best seen from the horizontal section (Plate VII., 

 Fig. 4.) It will be seen that serpents have developed to an 

 enormous extent the structure we have described as the olfac- 



