. The Protozoa. Protozoa. THE MASTIGOPHORA 129 are composed, for the most part, of descendants of one ancestor and are formed by incomplete division or by subsequent attachment. In these colonies, which are wonderfully varied, the individual monads in some cases are embedded in a transparent cellulose jelly secreted by the cells, and in which they lie freely, or attached to one another. Fig. 73. — Division of Gonium pectoralc O. F. M. a, 6, and e, undivided cells; c, d, f, k, and /, 4-celled stages; h, i, j, n, o, 8-celled stages; g, m, and/, 12-16-celled stages. by stalks, while in other case
. The Protozoa. Protozoa. THE MASTIGOPHORA 129 are composed, for the most part, of descendants of one ancestor and are formed by incomplete division or by subsequent attachment. In these colonies, which are wonderfully varied, the individual monads in some cases are embedded in a transparent cellulose jelly secreted by the cells, and in which they lie freely, or attached to one another. Fig. 73. — Division of Gonium pectoralc O. F. M. a, 6, and e, undivided cells; c, d, f, k, and /, 4-celled stages; h, i, j, n, o, 8-celled stages; g, m, and/, 12-16-celled stages. by stalks, while in other cases there is no surrounding matrix, the individuals remaining connected through incomplete division or by attachment subsequent to division. Gonium (Fig. 72), Pandorina, Uroglena, Proterospongia, Volvox, etc., have the cellulose jelly, while Dinobryon, Anthophysa, etc., are formed by attachment subsequent to division. In some of the more complicated colony-forms, especially in the Phytoflagellida, the adult condition is attained through cleavage stages as regular as in any metazoan egg. The formation of such 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 Calkins, Gary N. (Gary Nathan), b. 1869. New York, The Macmillan company; London, Mamcillan & co. , ltd.
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