384 



PHYSIOLOGICAL SERIES. 



tentatively called inferior occipital or collateral in the 

 Lemurs. There is also a depression in a position that 

 might be occupied by the extreme hinder end of the 

 calloso-marginal sulcus. 0. 0. 1337 c b. 



D. 553. The brain of a Marmoset (J/<i/'<i/< ' j, whits) (fig. 223). 



A dissection has been made in the left cerebral hemi- 

 sphere to open up the descending and posterior cornua of 

 the lateral ventricle. 



Fig. 223. 



CALCAR 



OLF.BULB 





In the descending cornu the diminutive hippocampus is 

 exposed. The posterior cornu is very extensive and is 

 occupied by a relatively enormous swelling calcar avis 

 of the mesial wall, which is produced by its indentation by 

 the calcarine sulcus. Even if it were not inappropriate 

 and confusing for other reasons, the term "hippocampus 

 minor " would be singulnrly inapt if it were applied to the 

 enormous broad expanse of the indented ventricular wall, 

 which is much better called M ralrar." 



Although a posterior cornu of the lateral ventricle is 

 occasionally Found in other Orders, such as tho Cetacea, 

 Ungtilata (e. <j. in the Camel), and Carnivora (e.g. in certain 

 Seals), it is only in the Primates, and more especially in 

 the Suborder Anthro|.oidea, that it assumes the extensive 

 proportions exhibited in this sp--eimrii. 



W. H. Flower, Phil. Trans, vol. clii. 18G2, p. 185. 



