. Fresh-water aquaria: their construction, arrangement, and management, with full information as to the best water-plants and live stock to be kept, how and where to obtain them, and how to keep them in health. Aquariums. FBESH-WATEE CEUSTACBANS. 293 like an "Indian club," or an elongated pear, and it is quite large enougk to be easily seen without the help of a noagnifying- glass. It has received the generic nanae of Cyclops, from the fact that it possesses only one eye, which is situated in the centre of the fore-part of the first and largest segment of its body; while the specific
. Fresh-water aquaria: their construction, arrangement, and management, with full information as to the best water-plants and live stock to be kept, how and where to obtain them, and how to keep them in health. Aquariums. FBESH-WATEE CEUSTACBANS. 293 like an "Indian club," or an elongated pear, and it is quite large enougk to be easily seen without the help of a noagnifying- glass. It has received the generic nanae of Cyclops, from the fact that it possesses only one eye, which is situated in the centre of the fore-part of the first and largest segment of its body; while the specific na,me of guadricornis (" four- homed") has been giyen to it on accoimt of what may be called its double antennae. The male Cyclops differs from the female in the formation of its antennae. The superior or upper anteimsB of the latter are long, tapering, and gracefully curved, while those of the former are rather shorter and thicker, and slightly swollen near their tips, which termi- nate ia a kind of hinge-joint. The lower pair of antennae of both the male and female are not nearly so long or so slender as their upper pair. All the anteimBB have numer- ous articulations, and are fringed with very fine fila- ments. Cyclops possess five pairs of legs, two pairs of foot-jaws, and at the end of their bodies two elongated lobes, to each of which are attached four set» of difEerent lengths; these setae, Uke the antennae, are also finely and beautifuUy fringed. The females are about three times as numerous as the males, and may very frequently be seen swimming about with their eggs hanging to each side of the lower part of their bodies. The eggs can easUy be detected with the naked eye, but under the microscope they look very like bunches of grapes. In each cluster there are sometimes as many as thirty or foi-ty eggs. M. Jurine is said to have made careful observations and calculations in regard to the increase of these Entomostraca, and he came to the conclusion that one
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaquariu, bookyear1890
