-Olfl 



Mect.cbl 



Sfi.cd- 



Med. cbl 



FIG. 83. Brain of frog. A, dorsal s'de; B, ventral side; C, left side; D, in vertical 

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

 ch.plx 1 anterior, and ch.plx* posterior, choroid piexus ; coin, commissures connecting 

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

 menceplialon; for.M, foramen of Monro; /', iter, or aqueduct of Sylvius ; ////, infuri- 

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

 optic vesicle; pin, pineal body ; pit, pituitary body; Sp.cd, spinal cord; v 8 , third ven- 

 tricle; v*, fourth ventricle; I-X, cranial nerves; / Sp, 2 Sp, first and second spinal 

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



2Q2 



