LIST OF ILLUSTRATIONS. XIX 



FIG. PAGE 



149. A transverse section of the brain of the sturgeon behind the 



anterior commissure 303 



150. A diagram of the fiber tracts in the forebrain of a tailed 



amphibian (Necturus) 306 



151. Simple diagrams to show the history of the epistriatum in 



fishes and amphibia ' 308 



152. Sketches of transverse sections through (A) the caudal part 



of the epistriatum in amphibia and (B) the corresponding 

 structure in Ornithorhynchus. B after G. Elliot Smith . 310 



153. A sagittal section of the forebrain and interbrain of a chick 



embryo of 7.0 days. After Minot 312 



154. Part of a transverse section of the cortex of a chameleon. 



After Cajal 313 



155. Transverse section through the forebrain of Lacerta at the 



level of the anterior commissure. After Cajal 314 



156. A transverse section through the right lateral lobe of the 



forebrain of Lacerta. After Cajal 315 



157. A diagram of the mesial surface of the hemisphere of a reptile 



to show the extent of the hippocampus and related structures. 316 



158. A mesial sagittal section of the brain of an embryo of Sphe- 



nodon punctatum. From G. Elliot Smith 317 



159. The mesial surface of the right half of the brain of Ornitho- 



rhynchus. From G. Elliot Smith 318 



160. The mesial surface of the cerebral hemisphere of a marsupial 



(Phascolarctos). From G. Elliot Smith 319 



161. Portion of a transverse section through the brain of a Moni- 



tor (Hydrosaurus). From G. Elliot Smith 320 



162. Transverse section of the cerebral hemispheres of Ornitho- 



rhynchus. From G. Elliot Smith 321 



163. Plan of cerebral hemispheres, lamina terminalis and optic 



thalami in horizontal section. From G. Elliot Smith . . 322 



164. Sagittal section of the commissural and precommissural 



regions of the hemisphere of Ornithorhynchus. From G. 

 Elliot Smith 323 



165. Ventral surface of the brain of Ornithorhynchus. After G. 



Elliot Smith 324 



166. Transverse section of the brain of a rat of four days through 



the anterior commissure. From Cajal 325 



167. Diagram of the mesial surface of (A) the hemisphere of a 



