S i6 



MANUAL OF ZOOLOGY 



verse band of fibres connecting together the posterior 

 parts of the optic thalami. The latter (o. tti) are large 



M10 



FIG. 310. Lepus CUniculus. Two dissections of the brain from above (nat. size). 

 In A, the left parencephalon is dissected down to the level of the corpus callq- 

 sum; on the right the lateral ventricle is exposed. In B, the cerebral hemi- 

 spheres are dissected to a little below the level of the anterior genu of the corpus 

 callqsum; only the frontal lobe of the left hemisphere is retained; of the right, a 

 portion of the temporal lobe also is left; the velum interpositum and pineal body 

 are removed, as well as the greater part of the body of the fornix, and the whole 

 of the left posterior pillar; the cerebellum is removed with the exception of a part 

 of its right lateral lobe; a. co, anterior commissure; a.fo, anterior pillar of for- 

 nix; a. pn, anterior peduncles of cerebellum; b.fo, body of fornix; cb l , superior 

 vermis of cerebellum; c6 2 , its lateral lobe; c.gn, corpus genictilatum; c.h, cere- 

 bral hemisphere; ch.pl, choroid plexus; cp. cl, corpus callosum; cp. s, corpus 

 striatum; c. rs, corpus restiforme; d. p, dorsal pyramid; _fl, flocculus; hp. m, 

 hippocampus major; in, co, middle commissure; o. f 1 , anterior; o 1-, posterior 

 lobes of corpora quadrigemina; o. th, optic thalamus; otr, optic tract; /. co, pos- 

 terior commissure; p fo, posterior peduncles of cerebellum; /. i<a, fibres of pons 

 Varolii forming middle peduncles of cerebellum; sp. hi, septum lucidum; st /, 

 stria longitudinalis; t. s, toenia semicircularis; v. vn, valve of Vieussens; z/ 3 , 

 third ventricle; z> 4 , fourth ventricle. (From Parker's Zootomy.) 



masses of mixed gray and white matter forming the lateral 

 portions of the diencephalon ; they are connected together 



