Economic mollusca of Acadia (1889) Economic mollusca of Acadia economicmollusca00gano Year: 1889 98 THE ECONOMIC MOLLUSCA OF ACADIA. Jones. Prince Edward Island, common and lar^e, Dawson. Abundant on every sand bar, J. H. Duvar. Undoubtedly- one of the most common of Molluscs around the entire coast of Acadia. 5i pfi oas Habits. No reader of this paper can require a description of tliis species to enable him to identifj^ the Clam. Who does not know this most ubiquitous of Molluscs? But not so many, perhaps, have acquaintance with its habits. Upon every mud or sand beach around the sea-coast o
Economic mollusca of Acadia (1889) Economic mollusca of Acadia economicmollusca00gano Year: 1889 98 THE ECONOMIC MOLLUSCA OF ACADIA. Jones. Prince Edward Island, common and lar^e, Dawson. Abundant on every sand bar, J. H. Duvar. Undoubtedly- one of the most common of Molluscs around the entire coast of Acadia. 5i pfi oas Habits. No reader of this paper can require a description of tliis species to enable him to identifj^ the Clam. Who does not know this most ubiquitous of Molluscs? But not so many, perhaps, have acquaintance with its habits. Upon every mud or sand beach around the sea-coast of Acadia, the visitor will see very many round holes, half an inch in diameter, from which, as he walks near them, streams of water are frequently forcibly ejected. At the bottoms of these, at a depth of from six inches to over a foot, according to locality and character of the soil, the Clams are to be found, standing up- right at the bottoms of their burrows,for such they are. Yet it does not properly stand upright in the sense that a man does, for it stands head downwards, the tough, black, protruding part, common- ly called the head, not being that organ at all. If this black part be dissected, it will be found to consist of two tubes, the ' siphons,' bound together, with thick, tou^h walls, both leading into the general cavity of the animal in which all of the internal organs lie. The only other opening into the animal's body is a small one at the opposite end which alloAvs the animal to thrust out its muscular, extensible ' foot.' It is by the use of this foot that it can move up and down in its burrow, within certain limits, or form a new one if necessary. If a Clam be placed upright in some sand at the bottom of a glass vessel of salt water it will need only careful watching, with perhaps a little experimenting, to show that there is a current flowing into one of the tubes—that away from the hinge side and the larger—and a current out of the other, or the smaller on
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