. A manual of zoology. Zoology. 21S CCELENTERATA vhicli Ihc i^onophorcs arise from ihe hlasloslvlr, a specialized polyp, without or tentacles (h' i;i, /"). The typical Campanularix produce medusa-, while some forms, like Tliaumanlid''- and Aiquoria* have no hydroid stage; on the other hand, Scrtidaria*- and Pliiniularia"- have no medusa stage. Other common genera, Clytia* Dipliasia* and Aglaopliciiiif" among hydroids; Oif//j,* Tiiiia* Khcgwalochs'^ among me- dusa. Possibly the fossil CiRArTOLiTFS be- -si long near here. Only the perisarc is known; this has h>'drothec
. A manual of zoology. Zoology. 21S CCELENTERATA vhicli Ihc i^onophorcs arise from ihe hlasloslvlr, a specialized polyp, without or tentacles (h' i;i, /"). The typical Campanularix produce medusa-, while some forms, like Tliaumanlid''- and Aiquoria* have no hydroid stage; on the other hand, Scrtidaria*- and Pliiniularia"- have no medusa stage. Other common genera, Clytia* Dipliasia* and Aglaopliciiiif" among hydroids; Oif//j,* Tiiiia* Khcgwalochs'^ among me- dusa. Possibly the fossil CiRArTOLiTFS be- -si long near here. Only the perisarc is known; this has h>'drothec;t, in which it is supposed ^Sff the hydranths occurred. Order V. Trachymedusae. These medusa:, mostly from warmer seas, have no hydroid stage. The characters are given on p. 216, TracJiyitfiiia/'' Liriopr^ (fig. iSo), and Canipanella* in our waters, Gcrvoiiia, etc., in Europe. Order VI. Narcomedusae. In addition to the characters on p. 217 may be added that the tentacles arise from ^ the outside, above the rim of the bell. Cunocanlhiv''' (fig. iSo), Ciinina''', ^ The larva; frequently live as parasites on other medusa-, and they may be able to re- produce asexually, forming sacs in which new medusx are budded. Order VII. Siphonophora. The Siphonophora are among the most beautiful of pelagic animals, some transparent, some brightly colored. Each (fig. tSi) consists of a colony of indi\iduals springing from a common cccnosarcal tube which is strongly mus- cular and contains a central canal, lined with entoderm, by which the members Fig. iSi.—Diasrrani of Sinhono- colony receive their nourishment. phore (from Lang). .1-//, groups of different inilividuals; ih, cover- At one end the tube is usually closeil by inc scales; C(?, sonoi)horcs;/m', feci-l- n 1. c • • j 1 ,1 ru 4 :'','*:'',, ', . , 1; ,; ^. a lloat ol inyagmated cctoilerm, filled ing polyps; p, icclcrs ((hgcsUve); f^ ' sb, lloat; ,s\g, swimming bell (necio- with air, the piiciiiiialapliorc, which keeps cah'x
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
