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BRITISH ENTOMOSTRACA. 
pial eggs ; and have found, from repeated experimetfts, 
that those Daphniae which had ephippia became loaded 
with eggs soon after they had thrown off these organs, 
and had progeny again, without the intervention of males ; 
and that the young so born from these Daphniae, which 
had thrown off their ephippia and become pregnant, were 
also independent of the access of the male, and became 
mothers in the same manner as the young of other 
Daphniae. 
November 29th, I isolated a D. pulex with an ephip- 
pium ; 30th, ephippium is thrown off; December 4th, 
Daphnia has eggs ; 8th, young ones are born ; 9th, the 
mother, having been removed from the young imme- 
diately after their birth, was found to have eggs again ; 
16th, young ones born ; 20th, has eggs again ; 24th, young 
ones born ; 25th, has eggs again ; January 6th, young 
born — mother has eggs in ovary again ; 14th, young born 
— mother again has eggs ; 2 2d, young born ; February 1st, 
has eggs again ; 8th, young born. 
On the 8th December isolated one of the young born 
from the subject of last series of observations on the 30th 
November. On the 21st December she was found to 
have eggs ; 28th, young born ; 29th, has again eggs ; 
January 9th, young born — mother has eggs again ; 24th, 
young born ; 25th, has eggs again ; February 1st, young 
born — mother has eggs again; 9th, young born; 27th, 
has eggs again ; March 8th, young born. 
In both of these experiments the young were always 
removed from the vessel in which the mother was kept as 
soon as born. 
On the 2d November I placed several ephippia in a 
glass of clear water. On the 10th two young Daphniae 
were born — isolated one of them ; December 1 2th, this 
Daphnia has given birth to several young, and has eggs 
again ; 18th, has again given birth to several young ; 19th, 
has eggs again ; 24th, young born ; 25th, has again eggs ; 
January 6th, young born ; 25th, after two several moult- 
