1 1 AB ITS AND LIFE-HISTORY OF STICHOPUS JAPONICUS. 



3 



individuals, their reproductive tubes had already grown to the length 

 of about 7 an. although it was still difficult to distinguish the sexes. 



I will now proceed to give my observations on the growth of the 



reproductive lubes and the duration of the breeding season. 



The following tables give the details of the more important of 

 these observations. Among these the records for 1894, Dec. 26, 1895, 

 Jan. 28, Feb. 28, April I, May 5, and June 6 together form a series of 

 successive observations with the interval of about one month between 

 every two dates. The specimens were either specially, dredged or 

 bought directly from fishing-boats on their fishing grounds. 



December. 



Dec. 26, r894 at Kanagawa. 



Indivi- 

 duals 



Size of individuals 

 LengthXBreadth 

 in cm. 



Condition of Reproductive organs. 



I 



24 X 4 



Reproductive tubes somewhat elongated. Sex not yet distinct. 



2 



23 X 8 



( Reproductive tubes ca 10 cm. long. No characteristic color of sex as 



3 



25 X 10 



I yet. Barely possible to recognize sex with the naked eye. 



4 



25 X 4 



Reproductive tubes not elongated at all. Ì 







( Probably young. 



5 



16 x 3.5 



Do. > 



6 



14 x 5 



? (No records). 



January. 



Jan. 28, 1895, at Kanagawa. 



Indivi- 

 duals 



Size of Individuals 

 LengthXBreadth 

 in cm. 



Condition of Reproductive Organs. 



I 



27 X 6.5 



Reproductive tubes elongated \ 





2 



25 X 6.5 



Do. } adult 



All looked like females : 



3 



27 X 6 



Reproductive tubes 16 cm. long. ' 



difficult to distinguish 



4 



22.5 X 4.5 



Reproductive tubes g cm. long. 1 possibly 



sex with the naked eye. 





/2nd year 



i 



5 



23-5 X 5.5 



Reproductive tubes 9 cm. long. 'ones. 





