FIG. 339 



340 



341 





Figs. 339-344. — The brain of fishes. The dorsal view of each brain is shown in the 

 upper figure, the ventral view immediately below. 339. Bdellostoma. (After JOH. 

 MuLLER.) 340. Petromyzon {AmmoccBtes stage). (After ZlEGLER's model.) 341. 

 Shark (angel-fish, Squatina). (After DUMERIL.) 342. Chimcera. (After WILDER.) 

 343. Lung-fish, Protopterus. (After BURCKHARDT.) 344. Perch, Perca. (After T. J. 

 Parker.) 

 AQS. Aqueduct of Sylvius. DSE. Diverticula of saccus endolymphaticus. E. 



272 



