REGENERATION IN FUXDULUS. 



345 



water in the Biological Laboratory of the U. S. Bureau of Fish- 

 eries at Woods Hole, Mass. I am indebted to Dr. Francis B. 

 Sumner, the director of the laboratory, and to the commissioner, 

 the Hon. George M. Bowers, for the facilities extended. The 

 fishes were fed regularly until September 5, a period of a month, 

 during which time new caudal fin tissue regenerated from the 

 cut surface of each fin. The fishes were then removed, carefully 

 preserved and later measured. There were alive, on September 

 5, 1 08 Fund i tins Jictcroclitns and 50 I'ltndnlns majalis. Table I. 

 shows the length, the amount regenerated and the specific regen- 

 eration of each Fnndnlns Jictcroclitns. Following this is Table 

 II. which shows the same with regard to the Fnndnlns majalis 

 used. 



TABLE II. 



FunJulus i/iaja/is. 



On examining the specific regeneration in the case of Futuinln $ 

 Jictcroclitns there is seen to be a gradual fall in percentage from 

 the shorter to the longer fishes. To make this more plain we 

 can divide the fishes into groups ranging from the shorter to the 



