. Fresh-water biology. Freshwater biology. FLAGELLATE PROTOZOA (MASTIGOPHORA) 255 99 (loo) Resembling Spkenomonas, but without ridges; flagella two, unequal. Clostonema Stokes. Representative species. , . . Clostonema socialis Stokes 1886. Body fusiform, with a short, rounded posterior prolongation. Primary flagel- lum as long as the body; secondary, about one-fourth as long. A long, pha- ryngeal passage present. Length about 20 ji. In standing water. Fig. 407. Clostonema socialis. X 600. (After Stokes.) ICX3 (99) Resembling Clostonema, but with a single flagellum. Menoidium Perty. Representat
. Fresh-water biology. Freshwater biology. FLAGELLATE PROTOZOA (MASTIGOPHORA) 255 99 (loo) Resembling Spkenomonas, but without ridges; flagella two, unequal. Clostonema Stokes. Representative species. , . . Clostonema socialis Stokes 1886. Body fusiform, with a short, rounded posterior prolongation. Primary flagel- lum as long as the body; secondary, about one-fourth as long. A long, pha- ryngeal passage present. Length about 20 ji. In standing water. Fig. 407. Clostonema socialis. X 600. (After Stokes.) ICX3 (99) Resembling Clostonema, but with a single flagellum. Menoidium Perty. Representative species. Menoidium pellucidum Perty 1852. Body lunate, obliquely truncated at the anterior extremity. Pos- terior end rounded. The short side of the body thin and sharp, the long side rounded. Flagellum equaUing the body in length. One or more amylaceous corpuscles usually present. Length 40 to 60 m. Fresh water. Fig. 408. Menoidium pellucidum. X 500. (After Senn.). loi (88) Body rigid or plastic, usually symmetrical; one or two dissimilar flagella deeply sunk in the body. Nutrition holozoic. Family Peranemidae . 102 102 (109) Body plastic 103 103 (108) One flagellum 104 104 (105) Oval, flattened, very flexible; distinct pharynx and rod-like organ back of the mouth Peranema Dujardin. Representative species. Peranema trichophorum Ehrenberg 1838. Cuticle finely marked spirally. Flagellum very long, vibratile at the tip only. Nucleus central. Fig. 409. Peranema trichophorum. X 250. (After Conn.) Conn reports a number of undetermined forms which bear considerable resemblance to the above species and should, without doubt, be assigned to the genus Peranema. JOS (104) Flask-shaped; neck-like anterior end with elongated pharynx and rod-like organ 106. 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 Ward, Henry
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
