A treatise on zoology . from the left hydro-coel; ih) the main body-cavity derived chiefly from left posteriorcoelom, which in Pelmatozoa, Stelleroidea, and Echinoidea becomesmainly adoral; (c) the aboral body-cavity of Pelmatozoa (with columnal extensions), of Stelleroidea,and of Echinoidea; {cl) the axialsinus of the same three classes,derived from the anterior coelom,running down into the stem in Pel-matozoa, indirectly connected withthe hydrocoel through the stonecanal, and containing the axialorgan (p. 23); (e) a perioeso-phageal sinus, sometimes subdivided,is completely or incompletely s
A treatise on zoology . from the left hydro-coel; ih) the main body-cavity derived chiefly from left posteriorcoelom, which in Pelmatozoa, Stelleroidea, and Echinoidea becomesmainly adoral; (c) the aboral body-cavity of Pelmatozoa (with columnal extensions), of Stelleroidea,and of Echinoidea; {cl) the axialsinus of the same three classes,derived from the anterior coelom,running down into the stem in Pel-matozoa, indirectly connected withthe hydrocoel through the stonecanal, and containing the axialorgan (p. 23); (e) a perioeso-phageal sinus, sometimes subdivided,is completely or incompletely sepa-rated from (/>), especially in Holo-thurioidea, Echinoidea, and Ophi-uroidea. The coelomic cavities are linedby pavement endothelium, usuallyciliated, and sometimes further pro-vided with special ciliated or flagel-lated organs which keep the con-tained fluid in motion { urnsof Synaptidae (Fig. V. 4, pciliated cups of Crinoid(1 corpuMcie esi)ccially nininiles; free flairellntt iiKiiioius |)iK- II r y V • i. Fid. of tlio cooloiriic lliiid 1 andsphaera 2 frotii tliH Kchiiioiil, Kchlnun(after OoddaM). 1, aiiioflboiwith ^rnntdtfs of hrown fttrnmntit, jwrhnps rfs|»iratr)ry. J, aiiio)d)oidwhit« rorpiiHcN) with rnticular pHtudo-podia. 8, from tlio Opiiiiiroifl, (yphvu-ti>ivireiis (aftur Fo»!tlliiK«r) ; corpiiscltiH Hiiapes, with riid colour Hiipposfddun tr) haMiiioKhihiri. 4 and Ti from thellolothiiriaii, Ikynnelbi gnnnmta (aftfrHowtdi). 4, wliitc corpiiHclti. f), oval,nucl»^al«i, bIcoiivtX corpUMchi, CMjloiin-drod hy hariiioKiohin. All iiitich iiiaKidllt<d. 233); arms, cells of P]chinoidea). The fluid issimilar to that found in the lacunar blood-vascular system ; it is sea-water, perhaps taken in through themadreporito, containing a variableunioiint of al])umen in solution,especially in the lacunar system,and somotimoa slightly yellowish or reddish. In it float variousbodies, viz. {(t) amoobocytos (Fig. XIX. 1, 2, 4) capable of wan
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
