FIG. 339 



340 



341 



- 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. 

 MiJLLER.) 340. Petromyzon (Ammoccetes stage). (After ZlEGLER'S model.) 341. 

 Shark (angel-fish, Squatind). (After DUMERIL.) 342. Chimczra. (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 



