File:Image from page 133 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14784645452).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: t makes a market for the crayfish. Astacus nu/res-cens is the crayfish sold in San Francisco markets. ()nthe Atlantic coast, New York and New Orleans are themain centres of consumption. Cambarus affims, takenfrom the Potomac River, is the crayfish found in the springin the New York markets. Later in the season thismarket is supplied by C. virilis and immunis, which areshipped from Montreal, Milwaukee, and other Westerncities. Edible Crabs.--Of the crabs which reach our market the most important is the blue crab. These crabs are kept moored in floating boxes until they have moulted, and then they are sent to market as soft-shelled crabs. i 114 ZOOLOGY The shore crabs, Cancer, are little eaten in the UnitedStates.1 Edible Carididae. - The shrimps and prawns have withinrecent years begun to appear in large numbers in theEastern markets. For many years the Pacific species P J? :.*%<s «*—. -- .M X:A A^ ^ .«£ \,:: lawv-

Text Appearing After Image: FIG. 110. — Lhniihts2)o!i/i>Jiiiiux, the king-crab or horseshoe-crab. have been dried and shipped by the Chinese in largequantities to China. 1 Very unfortunate is the destruction of the king-crab, Limulus,which is only distantly related to the Decapoda. In Delaware Bay theyare caught in great numbers and ground up as fertilizer. As they aretaken only during the breeding season, they are being rapidly extermi-nated. The American Limulus belongs to an order entirely unrepresented011 the European coast (Fig. 110). THE CRAYFISH AND ITS ALLIED 115 Development of Lobsters. — Lobsters lay eggs in July andAugust. In the fall they migrate to deep water, and passthe winter there. In the spring they migrate back to theshore — the females tarrying behind the males until theeggs of last summer, which she still carries attached toher swimmerets, shall be further advanced. In June theyoung hatch out, moult, and swim to the surface. The

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