. Fresh-water biology. Freshwater biology. 194 (191) Colonies spherical or ellipsoidal; cells differentiated as to size and function. ... ... 195 195 (198) No protoplasmic processes connecting the cells. Small vegetative cells at the anterior pole, large gonidial cells at the posterior pole. Pleodorina Shaw 196 196 (197) Cells sixty-four or one hundred and twenty-eight, about equally divided between large and small. Pleodorina californica Shaw 1893. Colony spherical, with gonidial cells two or three times the size of the vegetative cells. Cells biflagel- late, not in contact with each other. R
. Fresh-water biology. Freshwater biology. 194 (191) Colonies spherical or ellipsoidal; cells differentiated as to size and function. ... ... 195 195 (198) No protoplasmic processes connecting the cells. Small vegetative cells at the anterior pole, large gonidial cells at the posterior pole. Pleodorina Shaw 196 196 (197) Cells sixty-four or one hundred and twenty-eight, about equally divided between large and small. Pleodorina californica Shaw 1893. Colony spherical, with gonidial cells two or three times the size of the vegetative cells. Cells biflagel- late, not in contact with each other. Reproduction asexual, by gonidial cells, in this and other species of the genus. Found in ponds, ditches, and streams. Fig. 450. Pleodorina calijornica. X 300. (After Shaw.). 197 (196) Cells thirty-two, rarely sixteen or sixty-four. Vegetative cells, four in number. . Pleodorina illinoisensis Kofoid 1898. Colony ellipsoidal with cells arranged in five circles; the polar circles with four cells each, the other three circles with eight cells each. The gelatinous sheath enclosing the colony is of two layers. Gonidial cells much larger than vegetative cells, the latter always directed forward during movement. Each cell with two flagella, an eye-spot, a nucleus, and a single chromatophore. Average length 11311. Plankton 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 Ward, Henry Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint author. New York, John Wiley & sons, inc. ; [etc. ,etc. ]
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
