. Zoology : for students and general readers . Zoology. 28 ZOOLOGY. Class III.—Gregarinida {Gregarines). General Characters of Gregarinida.—The largest and best known species of this group is an mmate of the intestinal canal of the European lobster, and was named by E. Van Beneden Gregarina gigantea (Fig. 18). It is worm-like, remarkably slender, and is sixteen mil-. Fig. 18.— Gregarina gigantea. Z, two individutils of natural size, ff, ttie same much enlarged; )7, nvicleus. A, the same encysted. 5, Bubdivieion of the cyst. C, divi- fiion of the contents of cyst into Bmall spheres, observed in
. Zoology : for students and general readers . Zoology. 28 ZOOLOGY. Class III.—Gregarinida {Gregarines). General Characters of Gregarinida.—The largest and best known species of this group is an mmate of the intestinal canal of the European lobster, and was named by E. Van Beneden Gregarina gigantea (Fig. 18). It is worm-like, remarkably slender, and is sixteen mil-. Fig. 18.— Gregarina gigantea. Z, two individutils of natural size, ff, ttie same much enlarged; )7, nvicleus. A, the same encysted. 5, Bubdivieion of the cyst. C, divi- fiion of the contents of cyst into Bmall spheres, observed in another species. N, the spheres enlarged. 3/, cyst filled with pseudonavicellee, 0.—After Lieberkuhn. B—F, moner-like young of O. gigantea. ft, H. pseudofllaria stage. 7, ./, early nucleated forms of Greganna gigantea.—After Vau Beneden. limetres (oTer half an inch) in length, being the largest one-celled animal known. In this organism an external, structureless, perfectly transparent membrane with a double contour can be distinguished. It represents the cell-wall of the cells in the higher animals. Beneath this outer wall is a continuous layer of contractile substance, forming a true system of muscular fibrillse comparable to that of the Infusoria. The body-cavity of the Gregarina contains a. 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 Packard, A. S. (Alpheus Spring), 1839-1905. New York : Henry Holt
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879
