510 ANIMAL PHYSIOLOGY. 
Fic. 362.—A, C, the brain of a lizard (Psammosaurus Bengalensis), and B, D, of a bird (Melea- 
gris gallopavo, the sarees drawn as if they were of equal lengths (after ans sat A,B, 
viewed from above; C, D. from the left side. oy olfactory lobes ; Pn, pineal gland ; 
amp, cerebral hemispheres ; Mb, optic lobes of the mid-brain; Cb, cerebellum; M, 0, 
medulla oblongata ; zi, iv, vi, second, fourth, and sixth pairs of cerebral nerves ; Py. 
pituitary body. s 
Ley 
A 
Fie. 363.—Brains of a lizard (Psammosaurus Bengalensis) and of a bird (Meleagris gallopava) 
in longitudinal and vertical section. The upper figure represents the lizard’s brain; the 
lower, that of the bird (after Huxley and Carus). Letters as in the preceding figure. 
except L. t, lamina terminalis, or anterior wall of the third ventricle ; f. M, foramen of 
Munro ; a, anterior commissure ; Th. E, thalamencephalon ; s, soft commissure ; p, PS- 
terior commissure ; iv, indicates the exact point of exit of the fourth pair from that part 
of the brain which answers to the value of Vieussens. 
