12 
Fridtjof Nansen. 
[No. 7. 
Dotter eine annåhernd kreisformige etwa */ 4 des Dotters umgebende 
Keimscheibe, welche bestimmte Embryonalanlagen noch nicht er- 
kennen liess«. 
From W. MULLER/s important observations on these deposited 
eggs of Myxine, the following conclusions may be drawn, as he 
himself states: »dass Myxine ihre Eier in Schniiren legt und dass 
die Aneinanderreihung durch den Ankerapparat vermittelt wird, 
welcher von den beiden Polen jedes Eies ausgeht; es ergibt sich 
. aber ferner die im Hinblick auf die totale Furchung des Petromyzon- 
F2ies interessante Thatsache, dass die Furchung bei Myxine eine 
partielle ist«. He promises, also, that he will soon supply a more 
circumstantial account of the ova of Myxine; but it has, however, 
so far as I know, unfortunately, not yet appeared. 
As regards the time of oviposition, and how, or where, those 
deposited eggs were tåken, Muller's paper contains no information. 
From Cunningham's paper in » Zoolog. Anzeiger« X Jahrg. p. 391 
(1887) we learn, however, »that the late Professor A. W. Malm 
says in his »Vertebrate Fauna of Bohuslan«, that »the ova were 
presented to the Museum of Goteborg in Aug. 5, 1854, and that 
they had been found the year before ; that they were tåken from 
the stomach of a cod, but as to the time of the year when they 
were found nothing is known, and the person who found them has 
been dead several years«. The information was given to CUNNING- 
HAM by Dr. ANTON Struxberg, the present director of the Mu- 
seum of Goteborg. As stated by Prof. Max Weber (vide Zoolog. 
Anzeig. 1887 p. 319) the ova were found at Lysekil (Bohuslån), 
according to the label on the specimens. 
The most important account of the sexual organs of Myxine 
which has appeared, is given by Mr. J T. CUNNINGHAM in Quart. 
Journ. of Micr. Science Vol. XXVII, 1887. This author has investi- 
gated the minute structure of the immature testes, as well as that 
of the ovary; he has also made the most important observation 
that »a large proportion of immature Myxine are hermaphrodite, 
the posterior portion of the reproductive organ containing testicular 
capsules which have the same structure as those found in the 
male.« 
As regards the males CUNNINGHAM says (1. c. p. 70): »Among 
the hundreds of specimens which have passed through my hands, I 
have only succeeded in identifying eight males, and these are all 
very immature«. Of the male organs, he gives the following de- 
scription: »The (male) organ is similar in general arrangement to 
