File:Image from page 146 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14598359228).jpg

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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: unfavorable toDaphnia, so that not thesummer, but the spring andautumn are its periods ofmaximum reproductive activ-ity. This activity is like-wise checked in winter eventhough there is plenty offood. The family Branchiopoda 1is closely allied to the Clado-cera. The common repre-sentative of this family,Branchipus, has an elongated,distinctly segmented bodywhicli carries eleven pairsof lobed, leaf-like feet, func-tioning both as respiratoryand locomotor organs. Like Daphnia, Branchipus pro- - • FIG. 118.--Apus glacialis, ventral dlices Winter eggs Which Can aspect, abd.f., abdominal feet; Withstand desiccation even «nt f > antennule ; ant. 2, antenna ; lor., labrum ; ma., mandible; mx.,for years ; indeed, in Some cases, a certain amount ofdesiccation is a prerequisiteof hatching. Apus differsfrom Branchipus in having a broad shield (Fig. 118).The family Ostracoda2 comprises some very abundant, 1 j3pdyxia-> gills ; Totfs, foot. 2 HxrrpaKov, shell of a testacean ; eI5os, like.

Text Appearing After Image: first maxilla; ov., aperture of ovi-duct: .s. /. pi., sub-frontal plate;•s7f. f/l., shell-gland; tli.f., thoracicfeet; th.f. 1, first thoracic foot.After Bernard. 128 ZOOLOGY minute, bean-shaped little crustaceans, which have to movetheir appendages very vigorously to support their heavybodies in the water. The Ostracods are found in almostall pools and streams,, especially in the early spring. Manyof them seem to be exclusively parthenogenetic. / V


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