. Fresh-water biology. Freshwater biology. 189 (188) Zooids contracting together. Bodies very similar to Carchesium but central muscle continuous, causing all of the zooids to contract together. . Zoothamnium Stein. Representative species. . Zoothamnium adamsi Stokes 1885. Bodies about twice as long as broad, tapering to the pedicel; finely striated transversely. Length of zooids 60II. Reported from Niagara River. Attached to algae.. Fig. S43. Zoothamnium adamsi. cv, contractile vacuole; macn macronucleus. X lOO. (After Stokes.) 190 (187) Stalk not retractile 191. Please note that these images

. Fresh-water biology. Freshwater biology. 189 (188) Zooids contracting together. Bodies very similar to Carchesium but central muscle continuous, causing all of the zooids to contract together. . Zoothamnium Stein. Representative species. . Zoothamnium adamsi Stokes 1885. Bodies about twice as long as broad, tapering to the pedicel; finely striated transversely. Length of zooids 60II. Reported from Niagara River. Attached to algae.. Fig. S43. Zoothamnium adamsi. cv, contractile vacuole; macn macronucleus. X lOO. (After Stokes.) 190 (187) Stalk not retractile 191. Please note that these images Stock Photo

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. Fresh-water biology. Freshwater biology. 189 (188) Zooids contracting together. Bodies very similar to Carchesium but central muscle continuous, causing all of the zooids to contract together. . Zoothamnium Stein. Representative species. . Zoothamnium adamsi Stokes 1885. Bodies about twice as long as broad, tapering to the pedicel; finely striated transversely. Length of zooids 60II. Reported from Niagara River. Attached to algae.. Fig. S43. Zoothamnium adamsi. cv, contractile vacuole; macn macronucleus. X lOO. (After Stokes.) 190 (187) Stalk not retractile 191. 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 work.. Ward, Henry Baldwin, 1865-1945; Whipple, George Chandler, 1866-1924. joint author. New York, John Wiley & sons, inc. ; [etc. , etc. ]

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RMRDA6MX–. Fresh-water biology. Freshwater biology. THE LARGER AQUATIC VEGETATION 189 from the flower-stalk to serve as floaters. As there are land species of Utricularia which also have bladders, it seems quite probable that the aquatic forms have been derived from the land species. Some authors have suggested that, being without roots and re- quiring more nitrogenous food than can be obtained from sub- stances in solution in the water, these bladders have been developed to secure animal food. It is just as probable that the aquatic forms are merely using structures that were characteristic of their a

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