. Fresh-water biology. Freshwater biology. THE SPONGES (PORIFERA) 307 7 (8) Tubules of gemmules turned upward or outward from the groups. Spongilla fragilis Leidy 1851. Sponge encrusting in subcircular patches, thin at edges, occasionally one or more inches thick near the middle. In the most varied situations, apparently preferring standing water, though also in running water. Abundant. Gemmules abundant, primarily in one or more pavement layers. Also in compact groups surrounded by a cellular parenchyma charged with subcylindrical spined acerates. Skeleton spicules smooth, sUghtly curved, rat
. Fresh-water biology. Freshwater biology. THE SPONGES (PORIFERA) 307 7 (8) Tubules of gemmules turned upward or outward from the groups. Spongilla fragilis Leidy 1851. Sponge encrusting in subcircular patches, thin at edges, occasionally one or more inches thick near the middle. In the most varied situations, apparently preferring standing water, though also in running water. Abundant. Gemmules abundant, primarily in one or more pavement layers. Also in compact groups surrounded by a cellular parenchyma charged with subcylindrical spined acerates. Skeleton spicules smooth, sUghtly curved, rather abruptly pointed. True dermals wanting. Found in most of the United 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
