13 



vening time, the females produce eggs by the above 

 mentioned parthenogenesis. 



Of the crustacean Cyclops* and Daphnia,f I saw 

 still two other species, but so seldom indeed, that I could 

 not make any drawings of them. I consider them to be 

 Cyclops coronattis, (Copepoda) and Sida cristalllwa 

 (Phyllopda). The Sida cr. has six rowing feet, (natatory 

 feet) its abdomen, with its appendages, being carried in a 

 horizontal position, one branch of the antennes is two, 

 the other three jointed. Some were two millim. in length, 

 and furnished on their backs with a sucker, with which 

 they fasten themselves to the glass, lying there somtimes 

 for hours, keeping their rapidly-moving rowing feet of 

 foliaceous character, in constant motion to assist breath- 

 ing. {These legs are like Daphnia's of branchial 

 character, gill-like. fr. Ley dig.) A few species of the 

 Cyclops coronatus (Copepoda) had the length of 1,03 

 Mm. Their anterior and posterior antennes have hairy 

 appendages. The Cyclops, the Daphnia,J and the 

 Cypris (no popular name has been given to any of these 

 little organisms) give amusement for hours by their con- 

 stant jumps and leaps, as all four can easily be distin- 

 guished with the naked eye. 



If several of these Crustaceans be kept in a little aqua- 

 rium with algse, [Conferva, Batrachospermum, etc.,) they 

 may be observed for several months with their embryos, 

 eggs and manner of fructification. The Cyprids are 

 swarming in the swamps and ponds in the neighborhood 

 of the Central Park in millions, and they can be collected 



* James D. Dana describes several Cyclops species in his work : C. 

 Brasiliensis, Curticaudatus, Pubescens, McLeayi, Vitiensis. 



| In J. D. Dana's work, pp 1262 to 1275. 



\ De Kay places the Daphnians, after Cuvier, under the order Ostracoda, 

 and mentions a D. angulata and rotundata, found in stagnant water in the 

 forests of the Southern States. 



