. 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. 182 FEESH-WATER AQUABIA. elliptical capsule: they are hatcted in from sixteen to twenty days. Limnxa palustris (Fig. 121) is rather an elegant snail, but it is too great an eater of useful growing plants to be safely trusted for long in an ordinary aquarium. There are occasions, however, upon which it may be of use, such as when there is an excess of vegetation. It is always,
. 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. 182 FEESH-WATER AQUABIA. elliptical capsule: they are hatcted in from sixteen to twenty days. Limnxa palustris (Fig. 121) is rather an elegant snail, but it is too great an eater of useful growing plants to be safely trusted for long in an ordinary aquarium. There are occasions, however, upon which it may be of use, such as when there is an excess of vegetation. It is always, I think, interesting. The tank in which it is kept should be covered, or it will be very likely to escape and die. It is found in the lakes, ponds, ditches, and sluggish streams of nearly every pai-t of Britain. The animal is of a daz-k grey colour, tinged with violet, and spotted with black or yellow. The tentacles are conical. The FIG. 121. LiMNjjA PALUSTRIS. ^isc is slightly notched. The shell is about in length, conical in shape, and of a light or darkish horn-colour. There are six or seven whorls: the body-whorl more than equals half the shell. The sutures are rather deep, and the aperture is oval or almost so. This snail lays from sixty to eighty eggs, and incloses them in a somewhat cylindrical capsule. The fry are hatched in from sixteen to twenty days. Limnxa peregra (Fig. 122) is a rather handsome snail, and is perhaps commoner than any other aquatic mollusc. Some people do not give it a very good character as an inmate of the aquarium, but I am never without it, and find that it does more good than harm. I have just examined seven aquaria, large and small, in which snails of this species are kept, and have found only one solitary individual, out of the many, upon any of the plants. All the others seemed to be busy at work upon the sides of the tanks. These molluscs are good scavengers, as they are not at all unready, as I . have said, to become occasionally ca
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaquariu, bookyear1890
