58 g. o. saes. [No. 7. 



females, all domesticated in one of my aquaries — a rather large 

 glass jar — prepared on the 15th June 1886. I did not observe their 

 presence in that aquary till after my return from an excursion 

 in September. At that time there were plenty of specimens, 

 the greater part ovigerous. The aquary exhibited a luxurious 

 growth of vegetable matter, Confervse and some other aquatic 

 plants; and this condition would seem to have very much fa- 

 voured the growth and propagation of this Cladoceran, which un- 

 doubtedly, as is also the case with other Lynceidae, to a great 

 extent feeds upon vegetable matter. The Alonae did not disap- 

 pear as usual, on the approach of autumn, but continued to live 

 on even till the end of November. During that and the pre- 

 ceding month, most of the female specimens were found to be 

 provided with winter-eggs, and on examining the bottom-deposit, 

 numerous empty carapaces were found, most of them containing 

 a winter-egg. Meanwhile male specimens were by no means 

 rare. Before the close of the year, however, the specimens suc- 

 cessively disappeared, and at Christmas there was not a single 

 one yet alive. To convince myself, whether the temporary dry- 

 ing up of the winter-eggs is indispensable to their subsequent 

 development, I did not allow the water to evaporate during the 

 winter but from time to time renewed it, thus keeping the bot- 

 tom-deposit constantly submerged till the following summer, when 

 the Algae again began to grow. On the 1st June 1887 I first 

 observed several Alonae quite young, and in the course of that 

 month numerous specimens of the present species made their 

 appearance, all evidently hatched from the winter-eggs deposited 

 during the preceding year. The specimens continued to live and 

 propagate throughout the whole of the summer and autumn, but 

 again disappeared at the end of October. I still keep the aquary , 

 filled with water, to see if the Alonse will reappear this sum- 

 mer also. 



With respect to habits, this animal resembles the other 

 species of the genus, being on the whole a true bottom-form, 

 generally resting on the bottom or clinging to the walls of the 

 aquary or to the algae contained in the latter. Its swimming 



