. The life of inland waters; an elementary text book of fresh-water biology for American students. Freshwater biology. Diatoms III of water moss or a drop of sediment from the bottom without finding Naviculas in the mount. They are more abundant shoreward than in the open waters of the lake. The "white-cross diatom" Stauroneis (d), is a kindred form, easily recognizable by the smooth cross- band which replaces the middle nodule of Fig. 35. Diatoms. a. valve view showing middle and end nodules, and b, girdle view of Navicula. c, another species of Navicula; d, Stauroneis; e
. The life of inland waters; an elementary text book of fresh-water biology for American students. Freshwater biology. Diatoms III of water moss or a drop of sediment from the bottom without finding Naviculas in the mount. They are more abundant shoreward than in the open waters of the lake. The "white-cross diatom" Stauroneis (d), is a kindred form, easily recognizable by the smooth cross- band which replaces the middle nodule of Fig. 35. Diatoms. a. valve view showing middle and end nodules, and b, girdle view of Navicula. c, another species of Navicula; d, Stauroneis; e, valve view and /, girdle view of Tabellaria; g, Synedra; h, Gyrosigma; i, a gelatinous cord-like cluster of Encyonema showing girdle view of nine individuals and valve view of three, j, valve view and k, girdle view of Melosira; I, Stephanodiscus; m. Meridian colony, with a single detached individual shown in valve view below; n, a small colony of Asterionella; o, valve view, and p, girdle view of Camplylodiscus: q, cluster of Cocconema. (Figures mostly after WoUe). Tabellaria (e and /) is a thin fiat-celled diatom that forms ribbon-like bands, the cells being apposed, valve to valve. Often the ribbons are broken into rectangu- lar blocks of cells which hang together in zig-zag lines by the corners of the rectangles. The single cell is long- rectangular in girdle view (slightly swollen in the middle and at each end, as shown at e, in valve view), and is traversed by two or more intermediate septa. Tabel- laria abounds in the cool waters of our deeper northern lakes, at all seasons of the year. It is much less common in 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 Needham, James G. (James George), 1868-1956; Lloyd, John Thomas, 1884- joint author. Ithaca,N. Y. , The Comstock Publishing Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1915
