Identifier: introductiontozo00dave Title: Introduction to zoology; a guide to the study of animals, for the use of secondary schools; Year: 1900 (1900s) Authors: Davenport, Charles Benedict, 1866-1944 Davenport, Gertrude Anna Crotty, 1866- Subjects: Zoology Publisher: New York, Macmillan company London, Macmillian and co., ltd. Contributing Library: MBLWHOI Library Digitizing Sponsor: MBLWHOI Library

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Text Appearing Before Image: 182 ZOOLOGY The Solenidse1 include the razor-shell (Fig. 167).This animal, like the shell, is elongated and subcylindrical.By means of its foot, which can be protruded between the

Text Appearing After Image: FIG. 167. — Emis direct us. Young. Nat. size. Photo, by W. H. C. P, \alves, it excavates, with great rapidity, a hole in the sandor mud, into which it draws itself. These mollusks aresometimes used for food, but it is not easy to get them inquantity. The Mactridae2 include species commonly known in theNorth as hen-clams and surf-clams. They are more ellip-tical and larger than the common hard-shelled clam or quo-hog, and have a proportionately lighter shell (Fig. 168).They are not often used as food because they become verytough when cooked. The Myidae3 include the common clam of New England,Mya arenaria, abundant along our whole Eastern coast andused as food chiefly in New England. These clams occurin great numbers in every mud-flat. Their great siphon isextended at high tide to the surface of the ground, so as totake in and throw out water (Fig. 169) ; but at low tide it isretracted, and the clam lies invisible in its burrow. Thisclam was much prized by the Indians, as the great,

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