FIG. 339 



340 



f~f-^ MT 



^f^'S., y^a 



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. Ckim<zra, (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 



