S. HATTA. 



47 



into the condition in the higher Craniota. These facts can have no 

 other significance than as a connecting link between Amphioxus and the 

 the Craniata, to which reference has already been made at the beginning 

 of the article. 



My obligations are due to Professor Mitsukuri and Professor 

 Watase for their kindness looking through the manuscripts. 

 Biological Laboratory, the Gakushuin, Tokyo. 



May 29th, 1901. 



