OTAKI : THE COMMON STURGEON OF HOKKAIDO. 8 1 



The specimens in the table are grouped into A. B, B' and C according 

 to the sizes and their probable age. The specimens in the group A are no 

 older than two months except the last one which is the second ^-ear, 

 while those in B and B' groups are possibly in the third year. Those in 

 the group C being matured and perhaps the largest. 



I beg here to express my best thanks to Prof. S. Hatta of the College 

 of Agriculture, the Tohoku Imperial University. Sappro. for his kind 

 advice and courtesy. 



Sapporo. August, 1907. 



