. The microscope and its revelations. i<;. 004.—I, two Hi/ilrir tii/iif [Scyphistoma-siage] of (//mica<-iipiU(it<i, with tw hi, in undergoing fission (jStfrofeiZa-stage).II, a and b of fig. I three days later. In o the tentacles aredeveloped beneath the lowest of the Ejtlnjrcr, from the stalkof the Strobild, which will persist as a Hydra tube. (AfterVan Beneden.) becomes detached, and swims freely away; and the same series ofchanges takes place from above downwards, until the whole pile ofdiscs is detached and converted into free-swimming Medusa1. Butthe original polypoid body still r
. The microscope and its revelations. i<;. 004.—I, two Hi/ilrir tii/iif [Scyphistoma-siage] of (//mica<-iipiU(it<i, with tw hi, in undergoing fission (jStfrofeiZa-stage).II, a and b of fig. I three days later. In o the tentacles aredeveloped beneath the lowest of the Ejtlnjrcr, from the stalkof the Strobild, which will persist as a Hydra tube. (AfterVan Beneden.) becomes detached, and swims freely away; and the same series ofchanges takes place from above downwards, until the whole pile ofdiscs is detached and converted into free-swimming Medusa1. Butthe original polypoid body still remains, and may return to itsoriginal polype-like mode of gemmation, becoming the progenitor ofa new colony, every member of which may in its turn bud off a pileof Medusa discs. The bodies thus detached have all the essential characters of theadult Jfeditsce. Each consists of an umbrella-like disc- divided atits edge into a variable number of lobes, usually eight; and of a SPONGES AND ZOOPHYTES stomach, which occupies ;i co
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
