FIG. 339 



340 



341 



ML 



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 (Ammoc&tes stage). (After ZlEGLER'S model.) 341. 

 Shark (angel-fish, Squatina). (After DUMERIL.) 342. Chim&ra. (After WILDER.) 

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

 PARKER.) 

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



272 



