THE INTEEBEAIN OE THALAMENOEPHALON. 



141 



have led to very contradictory results over the decussation, according to the 

 animal which the investigator has studied. Possibly the conditions vary 



Chlasma 



Dec. of tract, pallii. 



Deo. transrerea 



/ Peduncle of the decussatio 

 t, supra-mfuodibularis 



Fig. 90. — Horizontal section through the thalamus of an adult shark: 

 the ScylUum canicula. 



Ggl. of the central gray matter 



Decusg, tuherie 

 Tr. atrio-tbalara. ad lob. inf 

 Decuss. supra-infundibularia 



Tr. strio-tbalam 



Supplementary Ggl. to nuc. rotundua 



Nuol. rotundus 



Peduncle of Fritsch'a commissure 



Tr. lobo-oerebellares 



Comm. ansul 



Tr. tecto-bulb. et spin, cruc 



Terminal nucleus of the Trigem 



Fig. 91. — Horizontal section through the thalamus of a teleost: 

 GoHo fluviatiUs. 



even for different individuals of the same species. We are quite certain 

 -of the partial decussation in mammals^ especially man^ where degenerations 



