=Formation of the Deep Shell.=--Although the oyster lies upon the bottom with one shell above and one below, the shells are not upon the top and bottom of the body, but upon the right and left sides. The two shells are symmetrical in the young oyster; but after it becomes attached, the lower or attached side grows faster than the other, and becomes deep and spoon-shaped, while the free valve remains nearly flat. In nearly every case the lower or deep valve is the left.
=Cock Oysters.=--There is a belief among oyster-eaters, that the dark-gray or black oysters are male oysters, and are therefore superior to the female oyster. Such misinformation was evidently promulgated by oyster-openers in anticipation of a tip for serving selected oysters. There is no truth in the assertion, however, for there are just as many black female oysters as there are black male oysters. There is no characteristic color by which a male or cock oyster can be distinguished from a female oyster. Microscopic examination, or a scientific eye, is the means of discovering the sex of an oyster.
The black-oyster romance is of ancient origin. The Roman oyster-smashers successfully “worked it” on Pliny, Horace, and other ancient writers and epicures.
=Green Oysters.=--At least a million dollars worth of oysters are annually destroyed in New-York waters by sludge acid from the oil refineries and illegal dumpings. The acid kills the oysters the instant it touches them, and turns them green. There is very little danger that a poisoned oyster will reach the consumer, but the loss to the planter is enormous.
The green tint of the oyster, or in fact any distinguished color the oyster may possess, is due to the color of its food and to the nature of the surrounding bottom. The bottom of the Shrewsbury River is mud; the oysters take on a peculiar tawny color from their muddy bed. Rockaway oysters exist on a hard sandy bottom. If the beds are covered with sea-lettuce, as they often are, the oysters take on a delicate green tint. When the lettuce is removed by a strong tide or high wind, the oysters gradually assume their white, slightly grayish color. Their shells are round, thin, and brittle. The shells from mud bottoms are long, narrow, thick, and spongy. Intruded mud is enclosed by a thin layer of pearly shell.
