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

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Libinia dubia 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: lcurpus removedfrom shell, x Ifc. Photo, by W. H. C. P. FIG. 100. — HippaNat. size. Photo, byW. H. C. P. The Brachyura are represented on our shores by threeprincipal families, which may be designated as triangularcrabs, arched crabs, and square crabs. The spider-crabs, or sea-spiders, as they are sometimescalled, belong to the triangular crabs. As their nameimplies, their legs are very long and slender.3 These crabsfrequent oyster-beds and sea-bottoms in general. When 1 From iTTTTos, horse ; used by Aristotle as the name of a kind of crab. 2 Like talpa, the mole. 3 Fig. 101. 108 ZOOLOGY seen stalking over such uneven surfaces, the advantage ofthese stilt-like legs is at once evident. The surface of thebody of some species of spider-crabs is hairy, entanglinginorganic matter, while hydroids, barnacles, and algae attachthemselves to the shell. Libinia emarginata and dubia^the former ranging from Maine south, and the latter fromCape Cod to the Gulf of Mexico, are our two species which Text Appearing After Image: FIG. Wl. — IJliitiin dubia. One-third nat. size. Photo, hy W. H. C. P. undergo such concealment. The great Japanese spider-crab is said to be the largest of all the Crustacea, someindividuals measuring, from tip to tip of the first pair oflegs, 18 to 20 feet. The edible crab is a typical arched crab. It is so calledbecause the carapace is arched in front. The carapace isalso broader than long, and narrower behind than in front. THE CRAYFISH AND ITS ALLIES 109 The legs of this family are short and broad, and in somespecies the posterior pair is especially broad - - an adapta-tion for swimming. These crabsmay be divided into two groups— the burrowing crabs and swim-ming crabs. To the burrowingcrabs belongs the genus Cancer(Fig. 102), which includes theedible crab of Europe, especiallyprized in England, together withseveral American species; whileour common edible, soft-shelledor blue crab, Callinectes hastatus(Fig. 103), and the beautiful lady crab (Fig. 104)belong to the swimming g
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