THE TELENCEPHALON IN CYCLOSTOMES 385 
ie : ne AM 
We, \wh 
~ 
\ 
Fig. 17. The fourth section of the same series. Note the several divisions of 
the commissura superior (Osborn). The next three figures show that the great 
majority of the left stria medullaris decussates and that a large number of fibers 
pass through the nuclei habenulae to the opposite primordium hippocampi. 
