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File:Image from page 232 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14598340930).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: FIG. 200. — Physalia arethusa.Nat. size. After Agassiz. •net

Text Appearing After Image: nlc FIG. 201.—Halistemma terge-stinum. The entire colony.cw, coenosarc; dz, dactylo-zooid ; hph, hydrophyllium or bract; net, nectocalyx or swimming-bell; ntc, battery of nematocysts;p, polyp; pn, pneumatophore or float; t,tentacle. After Glaus. 214 ZOOLOGY warv (Physalia,1 Fig. 192), which often swarms in theGulf Stream. The huge float which lies on the surfaceof the water serves also as a sail by which the animal istransported by the wind. There are other smaller, moregraceful species of more typical form (Fig. 201). Thestructure of a siphonophore is very complex. From thefloat hangs a central stem. Upon this stem are buddedfeeding zooids — hydranth-like forms provided with mouthand tentacles — and reproductive zooids- - gonophore-likeforms which produce the germ cells. There are leaf -likeexpansions also, which are rudimentary medusae. All themany forms budded on the stem are modifications of thehydroid type. Contrasted with the Hydrozoa are the Scyphozoa,2 whichare, on the w


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Source Image from page 232 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900)
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