68 Bashford Dean Miemorial Volume 



embryos that had ever been taken, and in 1899 he published an account of the develop' 

 ment of Bdellostoma stouti, which was the first description of the general embryology of a 

 myxinoid. During the time he was searching for embryos, he examined several thousand 

 specimens of Bdellostoma stouti, and while engaged in a similar quest off the coast of 

 Japan in 1900-1901, he examined many specimens of Bdellostoma (Homea) burgeri. Doctor 

 Dean made many notes of his observations at the time he was catching the eels in Cali' 

 fornia and Japan. Also, he made sixteen excellent drawings for the purpose of illustrating 

 some of his observations on the growth of the genital system both male and female. 



That Dean intended to write further regarding the genital system of Bdellostoma 

 is evident from the fact that most ot the notes and drawings which he left unpublished 

 refer to this subject. On several occasions he expressed to me the desire to publish the 

 results of his investigations; but his life was so full of urgent tasks that he could never 

 find the time to do this. 



Inasmuch as I have been associated with Doctor Dean during the past several years 

 while working with his collection of Bdellostoma embryos, and have already published a 

 paper on the urogenital system of the Myxinoidea, I have been asked to prepare his 

 data on the genital system of Bdellostoma for publication in the Dean Memorial Volume. 

 I am very happy, indeed, in having this privilege. It gives me special pleasure because I 

 know that Doctor Dean earnestly desired to publish the results of his investigations, and 

 by doing this for him I shall have the opportunity to indicate my appreciation for a very 

 pleasant friendship with a man for whom I had the highest regard and respect. 



This paper is based chiefly upon the notes and drawings which Dean made at the 

 time he was examining the specimens of Bdellostoma. There are four notebooks labelled 

 "Bdellostoma." One of these contains the rough draft of his paper on the embryology of 

 Bdellostoma (1899); another contains written descriptions, sketches, and other information 

 regarding the embryos which he collected. The other two notebooks, a smaller and a 

 larger (marked IV) have furnished most of the information for the present paper, for in 

 them Dean recorded his observations. 



Here and there in this paper I have added the results of my own investigations. 

 During the summer of 1930, from June 18th to August 28th, I caught and examined 

 more than six thousand specimens of Bdellostoma stouti in Monterey Bay at Pacific Grove, 

 California. The special purpose of this work was to collect embryos of Bdellostoma, 

 and the results in this respect will be presented later. While catching the eels, however, 

 I made the observations which will be referred to in the present paper. 



For the opportunity of making my investigations, I gratefully acknowledge my in' 

 debtedness to the National Research Council, to the Bashford Dean Memorial Committee 

 of the American Museum of Natural History, and to the Committee on the Permanent 

 Science Fund of the American Academy of Arts and Sciences. I desire to express my 

 gratitude to Professor W. K. Fisher, Director of the Hopkins Marine Station, for gen' 

 erously placing at my disposal the facilities of the Station, and to Professor G. E. 

 MacGinitie for much assistance courteously and willingly given. 



