Med.cbl 



Sped 



Afed. cbl 



Fio. ?3. — r.rain of froi^. A, dorsal side; B, ventral side; C, left side; D, in vertical 

 longitudinal section through the middle. Cb, cerebellum ; Cer.Il, cerebral hemispheres; 

 ch.plx'^ anterior, and ch.plx'^ posterior, choroid plexus; com, commissures connecting 

 the right and left halves of the brain; Cr.C, crura cerebri; Di, diencephalon, or thala- 

 mencephalon; for.M, foramen of Monro; i, iter, or aqueduct of Sylvius ; mj, infun- 

 dibulum; Med.obl, medulla oblongata; Olf.l, olfactory lobe; Opt.l, optic lobe; opt.v, 

 optic vesicle; />/;/, pineal body; pit, pituitary body; Sp.cd, spinal cord; z^, third ven- 

 tricle ; z'4, fourth ventricle ; I-X, cranial nerves \ i ^p, 2 Sp, first and second spinal 

 nerves. (From Parker and Parker's Zoologv, after Gaupp and Osborn.) 



2y2 



