82 



Bashford Dean Memorial Volume 



In order to present the data contained in the tabulations in Doctor Dean's small 

 notebook, I have compiled the following table: 



TABLE III 

 DATA FOR BDELLOSrOMA BUROERl FROM DOCTOR DEAN'S SMALL NOTEBOOK 



The reader will observe that the years 1900 and 1901 are recorded in Dean's table, 

 Number II above. During this time he was fishing in Japan, therefore the data contained in 

 Table II refer to Bdellostoyna hurgen. That these data are compiled from those in the 

 tables in the small notebook is made evident by comparing Tables II and III. The dates 

 are almost identical; in the notebook a line has been drawn through Mar. 30, and Apr. 2 

 has been written below; the numbers, lengths and sizes of eels caught on the same dates, 

 the sizes of eggs, and other data correspond quite closely. Therefore, it seems quite 

 evident that the data in the tables shown in Dean's small notebook are for Bdellostom.a 

 hurgeri, caught on the coast of Japan in 1900-1901. 



Table III was compiled from Dean's data in order to show the sizes of immature and 

 mature males and females. The immature males average about 33 cm. in length, and the 

 immature females average from 33 to 38 cm. The average length of mature males is 42.5 

 cm., and that of mature females is 40.5 cm. The immature males and females are approxi' 

 mately of the same length, the females being a little the larger; the mature males are 

 larger than the mature females. In view of these facts it is impossible that Bdellostoma 

 hurgeri is a protandric hermaphrodite in the sense that Cunningham and Hansen meant in 

 regard to iVlyxine, namely, that during the young stages the eels function as males, and 

 when older become females, the transformation occurring .when the individual reaches a 

 body length of about 32 cm. 



