80 BRITISH ENTOMOSTRACA. 



pial eggs ; and have found, from repeated experiments, 

 that those Daphnige wliich 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 boi-n from these Daphnise, 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 

 Daphniaj. 



November 29th, I isolated a D. jmhw 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, Avas 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, yoimg born 

 — mother again has eggs ; 22d, 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 30tli 

 November. On the 2]st 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 

 M-ere 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- 



