File:Image from page 125 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14598285590).jpg

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: assinidae2 include certain crayfish-like specieswhich live on our coast, burrowing in mud-flats, wherethey live concealed during the day. On account of theirbeing of only medium size and difficult to obtain, they arecommonly little known. Our Eastern species are Grebiaaffinis (Fig. 97) and Callianassa stimpsoui. The hermit crabs (Pagurida33) occupy a position inter-mediate between the long and short tailed Decapods in 1 Palwmon Ohionis and Paleomonetes exilipes. 2 0a\d(Tcrivos, color of the sea. 3 irdyovpos, a kind of crab. 106 ZOOLOGY respect to the length of their abdomen. The abdomen issoft, and the animal protects it by inserting it within thecoiled shell of some gastropod. Moreover, the abdomen isasymmetrical, being coiled to one side to correspond withthe shape of the borrowed house (Fig. 99). The abdominalfeet become degenerate, with the exception of the posteriorpair, which are modified into a hook-like process, by meansof which the crab maintains itself securely in the shell.

Text Appearing After Image: FIG. OS. Eupagunis longicarpus. Two individuals in shells. Photo, whilealive by W. H. C. P. When one shell becomes too small, it is abandoned for alarger one. Numerous species of hermit-crabs occur onour coast, ranging from the shore line to a depth of severalhundred fathoms. Eupagurus longicarpus is the littleactive hermit found in almost any tide-pool from Massa-chusetts Bay to the Gulf of Mexico. Hydroids, polyps,sponges, often attach themselves to these borrowed shells(Fig. 98) ; indeed, a Chinese hermit-crab always bears ananemone on its large claw, with which it plugs up theaperture when obliged to retreat within its shell. One of THE CRAYFISH AX.D IT* ALLIED 10 the East Indian hermit-crabs, the so-called palm-crab, feedsupon cocoanuts, Avhich it opens by inserting its claws intothe eyes and then breaking the shell upon the rocks. The Hippidae include certain oval animals, which bur-row, like a mole, head first, in sandy beaches. The nameof our common eastern species, Hip paJ ta

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