TENTH ANNUAL MEETING. } 107 
differentiated before they begin to mount the rivers, and that the 
males do not ascend beyond the limits of brackish water. 
Dr. Pauly’s discovery is so interesting that I propose to trans- 
late his own account of it. The investigation was made, I 
believe, in Munich, and the report from which I quote was pub- 
lished in the Austro-Hungarian Fishery Gazette, at Vienna, Decem- 
ber 23d, 1880. Dr. Pauly writes: “ During the past year I have 
received from Court-Fisherman Kuffar a large number of eels, 
which I have used in my investigations. The large individuals, 
all of which came from the lakes of northern Italy, were females. 
I received, however, from the same individual, another lot of 
eels, consisting of much smaller individuals, weighing from 20 
to go grains (2-3 of an ounce to 3 ounces), also taken in fresh 
water. At the request of Professor Von Siebold, I had paid 
particular attention to the sexes of the eels which I was engaged 
in investigating, and to my great astonishment I found that a 
large majority of these small eels [19 out of 27] were males, pos- 
sessing instead of the familiar ovaries, the ‘lappenagan” 
described by Dr. Syrski. A histological examination of these 
organs convinced me that the structure of these tissues agreed 
with that described by Freud.” 
* Cage * * * * * * 
My next inquiry was very naturally concerning the locality 
whence these eels had been obtained. I learned that Kuffer had 
. received them two years before from Director Huack at Hun- 
ningen, and upon questioning Director Huack learned that they 
had been brought from a French river, the Sevre niortatse, where 
they were caught as young fry [montrée] at a distance of ten or 
twelve miles from its mouth, and furthermore were at the time 
of examination about four years old. The small size of these 
fish, their age being taken into consideration, satisfied us that 
they had been reared in captivity since uncultivated eels would 
have been much heavier. The females in this lot of eels exceeded 
the males in length and weight and exhibited those external 
characters described by Jacoby as indicating sex. 
The locality in the Sevre niortaise where these fish were taken 
may easily, especially at flood tide, have been within the limits 
