. The illustrated natural history [microform]. Reptiles; Fishes; Mollusks; Natural history; Reptiles; Poissons; Mollusques; Sciences naturelles. ^1^ X CHINESE WINDOW.—Waciiim placeiila. SADDLE-SHELL.—^/Kimm ciMjipium. LONG-HINGED OYSTER.—Ostrca Cuimdcnsls. based on tliose clia'-actcristics which in his own ju(lj,mient are most valuable. In the aiTangeniL'ut,^ however, which lias been followed in tiiese pages, the bivalves are divieled into two sections, founded on the presence or absence of the siphons through which the water passes for the double purpose of creating the l)lood, and supplying
. The illustrated natural history [microform]. Reptiles; Fishes; Mollusks; Natural history; Reptiles; Poissons; Mollusques; Sciences naturelles. ^1^ X CHINESE WINDOW.—Waciiim placeiila. SADDLE-SHELL.—^/Kimm ciMjipium. LONG-HINGED OYSTER.—Ostrca Cuimdcnsls. based on tliose clia'-actcristics which in his own ju(lj,mient are most valuable. In the aiTangeniL'ut,^ however, which lias been followed in tiiese pages, the bivalves are divieled into two sections, founded on the presence or absence of the siphons through which the water passes for the double purpose of creating the l)lood, and supplying the digestive organs with the necessary food. lu the first section, termed Asiplioiiida3, are included those bivalves in which the siphons are wanting. In the first family, of which the common Oyster is a very familiar instance, the two valves are unequal in size, and the animal inhabits the sea. The Oyster is too well known to need description; but it may be mentioned, that practical naturalists have for some years been carefully studying its habits, for the purpose of breeding the valuable mollusc artiticially, and so of securing a constant supply throughout the four months of the year during M'hich the creature is out of condition. In this country the system is being gradually carried out, but in France it is developed to a very large extent, and with great success. Tlie details of the process are too elaborate to be here described, but the general idea may he given in a few words. The very young spawn, or "spat," as it is technically named, is removed from the natural beds, and is dispersed in shallow "banks," so that each tiny Oyster has plenty of room, and can atllx itself to the bed of the bank without being injured by the pressure of its fellows. Fascines, mnde of slender branches, and sunk into banks paved with stone, birch, and broken earthenware, are found to be most useful for this purpose. In the banks near Dieppe, the Oysters are seen lyi
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Keywords: ., bookcentury1800, booksubj, booksubjectfishes, booksubjectmollusks
