76 



PHYSIOLOGICAL SERIES. 



peduncles to the ventricles of the olfactory bulbs. The walls 

 of the cerebrum aiv thick throughout, with no local swellings 

 -live of corpora striata. On either side a choroid 

 plexus projects downwards and forwards from the roof of the 

 thalaiiuMicophalon into each lateral ventricle. Behind the 

 cerebrum the brain has been longitudinally bisected and 

 the two halxes have been turned to either side. The saccus 

 vasculosus has been opened from behind showing its cavity 



Fig. L>0. 



LAT.VENT. 



OLF BULB. 



...TEL.CHDR 



FOR. LOB. INF. 

 ... GANG. HAB. 

 -- POST COMM. 

 ""LOB. OPT. 



CER. 



MED AUR 



Brain of Scyliium catttltu (dissected). 



< -ontinuous with that of the infundibulum, as well a- I 

 pair of large oval aporturo in the lateral walls of ihe 

 infundihulum that communicate with the ventricles of the 

 lohi infcriores. 



In the floor of the thalamencephaloD in front of the 

 . -Ilia-ma li'-r< is a small me<lian pit (recessus prajojiticus), 

 and at the point of union between the wall of the saccus 

 JoHU :uil the floor of the, mid-brain, another (saccus 

 infundihiili) \\hieh i> found al.-o in CyclofitoiDefl and einbrvo 

 TeleosU. 



