. The study of animal life [microform]. Zoology; Zoologie. 24© Tht Study of Animal Life part m segments and appendages varies greatly. The little larva whidi hatches from the egg is usually a " Nauplius "—an creature with only three pairs of appendages and a median eye. The brine-shrimps (A Hernia), the related genus Branchipus, the old-fashioned freshwater Apus ; the common water-flea Daphui^ and its relatives, like Lcptodora and Moina, are united in the okkt of Phyllopods. The small "water-fleas"' of which Cyptis is a very comii\on representative, and which a
. The study of animal life [microform]. Zoology; Zoologie. 24© Tht Study of Animal Life part m segments and appendages varies greatly. The little larva whidi hatches from the egg is usually a " Nauplius "—an creature with only three pairs of appendages and a median eye. The brine-shrimps (A Hernia), the related genus Branchipus, the old-fashioned freshwater Apus ; the common water-flea Daphui^ and its relatives, like Lcptodora and Moina, are united in the okkt of Phyllopods. The small "water-fleas"' of which Cyptis is a very comii\on representative, and which arc very abundant in sea and lake, foim the order of Another " water-flea" Cyclops and many more or less degeneiaie " fish-lice " and other ectoparasites ( Chondral anthus, Cali^^u;., Lernaa) are known as Copepods. The free-swimming forms often occur in great swarms and are devoured by fishes. The acorn-shells {Balanns) crusting the rocks, the (Ijspas) pendent from floating "timl)er," and the degenerate^a^vw//;/,; under the tail of crabs, represent the order Cirrij^dia. The higher Crustaceans are grouped together as Malacostracn. The bo survivor of their hypothetical ancestors, is the marine genus .\V/,;.'/.j, but we are more familiar with the Amphipmls ( Gnnimaru \ which jerk themselves along sideways or shelter under stones luitli in fresh and salt water. The wood-louse Onisais has counieriui;-> {Asellus, LioUa) on the shore, and several remarkable paraMiic relatives. Among the highest forms are the long-tailed lob^te^^ (/lomartis, ralinitnis), and crayfishes (As/aats), and slirimi» (Crangon), and prawns {PaUcmon, randalus)\ the sofltailea hermit crabs (Pagitrns); and the short tailed crabs ( Cuiiu-y. Carcinus, Diomia). {h) Protracheata.—Z''''"'/'''"^- This remarkable genus. iei>rc-. FiG. 46.—Peripaiu*. (From C! ambers's Encychp.; after Mo*«ley ) sented by about a dozen widely-distribute
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
