Text-book of comparative anatomy . st pair of which forms with thetelson a powerful caudal fin. Carididce (shrimps): Penceus, Palcemon, Crangon, Pon-tonin, Alplicus, Sergcstes, Lucifer, in the sea. Astacidcc: Astacus fluviatilis (Cray-fish, freshwater ; Figs. 202 and 203), Homarus (lobster), Ncphrops, CaUianassa, Gebia,marine. Palinuridce: Palinurus, Scyllarus, iu the sea. Sub-Order 2. Anomura (this division cannot be sharply demarcated). Abdomen moderately large; caudal fin mostly reduced. The hindermost pair of ambulatory feet or the two posterior pairs reduced. Third foot-jaws limb-like. Pa
Text-book of comparative anatomy . st pair of which forms with thetelson a powerful caudal fin. Carididce (shrimps): Penceus, Palcemon, Crangon, Pon-tonin, Alplicus, Sergcstes, Lucifer, in the sea. Astacidcc: Astacus fluviatilis (Cray-fish, freshwater ; Figs. 202 and 203), Homarus (lobster), Ncphrops, CaUianassa, Gebia,marine. Palinuridce: Palinurus, Scyllarus, iu the sea. Sub-Order 2. Anomura (this division cannot be sharply demarcated). Abdomen moderately large; caudal fin mostly reduced. The hindermost pair of ambulatory feet or the two posterior pairs reduced. Third foot-jaws limb-like. Paguridce, hermit-crabs, marine, in empty shells of Molluscs ; abdomen soft skinned, asymmetrical, with degenerated pleopoda serving as clinging organs. Pagurus, Eupa- Cli USTA CEA —S YS TEMA TIC HE VIEW 299 gurus, Birrjus (in holes in the ground). Hippidce, marine, live in mud ; posteriorbody hard skinned, the half of it bent forwards. The Galateidce (Galatea] approachthe Macnira, and the Porccllanidcc (Porccllana) the FIG. 203.—Astacus fluviatilis, from the ventral side. A, male; 7J, female. In the male the8th to 13th and 15th to 18th extremities of the leftside of the body are removed ; in the female the~2i\ and 4th to 13th of the right side. 3-13, Extremities of the cephalo-thorax ; , anterior andposterior antennae; gd, aperture of the antennal glands; wo, female ; mo, male genital aperture ;li-2Gi pleopoda; en, endopodite; ex, exopodite of the last pair of pleopoda; an, anus; t, telson(after Huxley). Sub-Order 3. Brachyura (Crabs). Body flattened. Posterior body without anal fin, reduced, bent round on theventral side of the cephalo-thorax. In the male only the two anterior pairsof pleopoda are usually retained. Notopoda, in the sea : Dromia, Dorippc, , round crabs : Calappa, Ilia, in the sea. Oxyrhyncha, tri&ngul&r crabs :Maja, Pisa, Stcnorhynckus, Inachus, Lambrus, in the sea. Cydomctopa: Tdphusa 300 COMPARATIVE ANATOMY CHAP. (fresh
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative
