. Fresh-water biology. Freshwater biology. Fig. 563. Spongilla igloviformis. A. Lateral view of dome-shaped group of gemmules. (Foraminal tubules open inward and are invisible.) X 25. B. Two types of spicules figured here; skeleton spicules, weakly spined: "parenchymal spicules" nearly equally long, but more spinous. X 100. (After Potts.) 9 (6) Gemmules not in layers or groups lo 10 (11) Dermal spicules birotulate. . Spongilla novae-terrae Potts 1886. Sponge encrusting, gemmules rather numerous, very large, crust absent or inconspicuous. Skeleton spicules relatively few, slender, gra
. Fresh-water biology. Freshwater biology. Fig. 563. Spongilla igloviformis. A. Lateral view of dome-shaped group of gemmules. (Foraminal tubules open inward and are invisible.) X 25. B. Two types of spicules figured here; skeleton spicules, weakly spined: "parenchymal spicules" nearly equally long, but more spinous. X 100. (After Potts.) 9 (6) Gemmules not in layers or groups lo 10 (11) Dermal spicules birotulate. . Spongilla novae-terrae Potts 1886. Sponge encrusting, gemmules rather numerous, very large, crust absent or inconspicuous. Skeleton spicules relatively few, slender, gradually pointed, smooth or microspined. Dermal spicules very abundant, minute, birotulate. Gemmule spicules smooth or irregu- lar, furnished with long spines, frequently located near the extremi- ties. Placed by some in genus Ephydalia. Found only in shallow water of lakes in Newfoundland (48° N. L.). i^/^%\:^ \' Jh Fig. 564. Spicules of Spongilla novae-terrae. Representing the slender, smooth or sparsely microspined skeleton spicules; the dermal spicules, birot- ulates of unequal size; and the spinous gemmule spicules. X lOo. (After Potts.). 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
