SPERMATOGENESIS IN MYXINE GLUTINOSA. 169 
Spermatogenesis in Myxine glutinosa. 
By 
J.T. Cunningham, M.A., 
Naturalist on the Staff of the Laboratory of the Marine Biological 
Association, Plymouth. 
With Plate LV. 
In a paper published in this Journal in 1886 (2) I described 
the generative organs and the peculiar protandrous herma- 
phroditism of Myxine. That description included a brief and 
incomplete account of the spermatogenesis, of which I had not 
been able, for want of leisure and material, to make a more 
deliberate investigation. In 1888, Dr. Fridtjof Nansen, then 
Zoological Curator at the Bergen Museum, published in the 
‘ Aarsberetning, or Annual Report of that Institution, the 
results of a study of the reproductive organs of the animal in 
question (3). Dr. Nansen’s researches were, as he himself 
states, suggested to him by my paper, and in a great many 
important matters he fully confirms my results. But with 
regard to the development of the spermatozoa he contradicts 
and rejects with perhaps unnecessary emphasis all my state- 
ments, and comes to the conclusion that I never saw the 
normal spermatozoa at all. 
I was therefore naturally desirous of going into the subject 
again and investigating it more fully. 1 was led to believe 
also that it was possible to obtain living Myxine with less 
trouble and less expense in the neighbourhood of Bergen than 
on our own coasts. I therefore decided to go to Bergen, and 
not only to study the spermatogenesis anew, but to make 
further attempts to obtain the fertilised ova. I was enabled to 
