. The Cambridge natural history. Zoology; Zoologia Geral. 124 PROTOZOA CHAP. irregularly and at intervals, resolving finally into 1-nucleate frag- ments, which encyst and pass into the water. When swallowed the cyst dissolves, its contents enlarge, and ultimately assume the adult Maupasia has a partial investment of cilia, a single l<mg flagellum and mouth, a contractile vesicle, and a single simple nucleus. It seems to find an appropriate place near the two above groups, though it is free, and possesses a mouth. Among the Euglenaceae, Euglena mridis is a very common. FIG. 42.—Longit
. The Cambridge natural history. Zoology; Zoologia Geral. 124 PROTOZOA CHAP. irregularly and at intervals, resolving finally into 1-nucleate frag- ments, which encyst and pass into the water. When swallowed the cyst dissolves, its contents enlarge, and ultimately assume the adult Maupasia has a partial investment of cilia, a single l<mg flagellum and mouth, a contractile vesicle, and a single simple nucleus. It seems to find an appropriate place near the two above groups, though it is free, and possesses a mouth. Among the Euglenaceae, Euglena mridis is a very common. FIG. 42.—Longitudinal Fission of Eutreji/in ft fid is (Euglenaceae), showing chloroplasts, nucleus, and flagella arising from pharynx-tube. (After Steuer.) form, giving the green colour to stagnant or slow-flowing ditches and puddles in light places, especially when contaminated by a fair amount of dung, as by the overflow of a pig-sty, in company with a few hardy Rotifers, such as Hydatina senta (Vol. II. Fig. 106, p. 199) and Bracliionus. Euglena is about O'l mm. in length when fully extended, oval, pointed behind, obliquely trun- cate in front, with a flagellum arising from the pharyngeal pit. It shows a peculiar wriggling motion, waves of transverse con- striction passing along the body from end to end, as well as flexures in different meridians. Such motions are termed " ; The front part is colourless, but under a low 1 Bezzenberger has given an analytical table of the eleven known species of the genus Opalina in Arch. Protist. iii. 1903, p. 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 Harmer, S. F. (Sidney Frederic), Sir, 1862-; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. [London, Macmillan and co. , limited; New York, The Macmillan company
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