. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. IITDEOZOA—SIPIIOXOPIIORA. 243 Order 2.—Sipiionophora.* Free-swimming loohjmorphous hydroid-stocks ivith contractile stem, with polypoid nutritive indi- viduals and medusoid buds, usually also with nectocaly- ces, hyrophyllia and dactylo- zooids. Morphologi- cally the/SiyiViO- nophora are directly allied to the hy- droid-stocks ; but they possess to a much greater extent than the latter the characters of individuals, in consequence of the highly developed poly- morphism of their polypoid and medusoid
. Elementary text-book of zoology, general part and special part: protozoa to insecta. Animals. IITDEOZOA—SIPIIOXOPIIORA. 243 Order 2.—Sipiionophora.* Free-swimming loohjmorphous hydroid-stocks ivith contractile stem, with polypoid nutritive indi- viduals and medusoid buds, usually also with nectocaly- ces, hyrophyllia and dactylo- zooids. Morphologi- cally the/SiyiViO- nophora are directly allied to the hy- droid-stocks ; but they possess to a much greater extent than the latter the characters of individuals, in consequence of the highly developed poly- morphism of their polypoid and medusoid appendages. The functions of the latter seem so inti- mately con- nected and are so essential for the preserva- tion of the entire colony that we may regard each colony of Sipho- * Besides Kolliker, C. Vogt, Huxley and others, compare C. Gegenba\ir, •' Beobachtungen liber Siphonophorcn," '/ieitschrift fur wIuk. Zool., 1853, Fig. 185.—Diagram of a colony of Pht/sophortda. St, Stem; Ek; ectoderm; En, entoderm; f'/i, Pneumatophor; Sk, nectocalj'X beins budded off; S, nectocalys ; D, hydrophyllium; a, gono- phore; T, dactylozooid ; Sf, tentacle ; P, polyp ; O, mouth of the latter ; i\rt, battery of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Claus, Carl, 1835-1899; Metcalf Collection (North Carolina State University). NCRS. London, Swan Sonnenschein
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanimals, bookyear1892
