The royal natural history . sed bya single adductor. Thesexes are separate inthe American oyster(Ostrea virginiana),but united in theBritish 0. edulis. Ina gastronomic point ofview the oyster standsfar above all othermolluscs, and its arti-ficial cultivation waspractised by theancient Romans, andat the present timeforms a most import-ant industry in manyparts of the oyster is veryprolific, a single in-dividual of the common species having been estimated to contain over a millionembryos, whilst the American form is said to discharge ten times as edulis is not full - grown unti
The royal natural history . sed bya single adductor. Thesexes are separate inthe American oyster(Ostrea virginiana),but united in theBritish 0. edulis. Ina gastronomic point ofview the oyster standsfar above all othermolluscs, and its arti-ficial cultivation waspractised by theancient Romans, andat the present timeforms a most import-ant industry in manyparts of the oyster is veryprolific, a single in-dividual of the common species having been estimated to contain over a millionembryos, whilst the American form is said to discharge ten times as edulis is not full - grown until about five to seven years old. Oysters areincapable of motion, and attach themselves to other shells, rocks, and othersubstances by the convex or deeper valve. During May, June, and July, theeggs are discharged into the gills, where they remain until hatched; and it isduring this period that oysters are out of season. Oysters are cosmopolitan;wherever there is a rocky coast, excepting in Ai-ctic climates, they are sure to. ONE VALVE AND SOFT-PARTS OP COMMON OYSTER. a, Position of mouth ; b, Mantle ; c, Adductor ; d, Junction of mantle-lobes ; (Nat. size.) e, Gills. BIVAL VES. 409
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectzoology
