62 AMPHIBIA. 



PLATE XVII. 



FIG. I. 



THE BEAIN OF THE TURTLE. 



(TESTUDO MYDAS.) 



1. STRIATED body, and a lesser oblong eminence seen on opening the lateral 



ventricle ; on the left side the choroid plexus is seen passing through an 

 opening in the septum, to communicate with that of the right side ; part of 

 the striated body has been removed on the right side. 



2. Thalamus of the optic nerve. 



3. Optic lobe and ventricle continued forward under the thalami, and forming a 



resemblance of the third ventricle, and then backwards into the cerebellum, 

 and to the calamus scriptorius. 



FIG. II. 



(THE SAME.) 



1. CUT surface, from which the striated body has been removed; it is the crus 

 of the brain, and is somewhat connected with the commissure of the optic 

 nerves : the thalamus on this side has been cut oif at its connection with the 

 optic tract. 



