The porifera and coelentera . d ^^ () 6 (^. >^ 1.—A small colony of Akyoniiun paimatum, Pallas, with expanded zooids. (Orisinal.) 2.—Vertical section through a small colony of Alcyonium digitatum, Linn., showing tlioelongated zooid cavities. (Oritjinal.) 3.—A colony of Sarcophi/tum piilmo, Esper, showing the pileus, P, bearing zooids, and thebarren stem, st. One-half natural size. (Original.) 4.—biagrammatic vertical section through a portion of a colony of Sarmphytum pvlnin,showing the retracted autozooids, az, and the siphonozooids, sz, connected by a network ofsolenia. (After Moseley). T
The porifera and coelentera . d ^^ () 6 (^. >^ 1.—A small colony of Akyoniiun paimatum, Pallas, with expanded zooids. (Orisinal.) 2.—Vertical section through a small colony of Alcyonium digitatum, Linn., showing tlioelongated zooid cavities. (Oritjinal.) 3.—A colony of Sarcophi/tum piilmo, Esper, showing the pileus, P, bearing zooids, and thebarren stem, st. One-half natural size. (Original.) 4.—biagrammatic vertical section through a portion of a colony of Sarmphytum pvlnin,showing the retracted autozooids, az, and the siphonozooids, sz, connected by a network ofsolenia. (After Moseley). The coenenchyma thus forms a stem, sometimes branched, from thesurface of which the free portions of the zooids project. Family 1. Xexiidae, Gray (pro parte). The zooids are not in the form of minute, feebly calcareous discs, often confined tothe ectoderm. The colony consists of a stout, fleshy, sterile stem, some-times bearing short lobose branches, on the expanded upper surface ofwhich the free moieties of the
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Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectctenophora
