. Fresh-water biology. Freshwater biology. Fig. 562. Spongilla fragilis. A. Section of group of gemmules; a, curved foraminal tubules, always out- ward; ft, envelop with acerate sjjicules. X 12. 5. Three types of spicules figured here; skeleton spicules, smooth, abruptly pointed; variable parenchymal spicules, subcylindrical, subspined; spined, spherical forms frequently seen throughout the species. X loo. (After Potts.) 8 (7) Tubules of gemmules turned inwards in tlie groups. Spongilla igloviformis Potts 1887. Sponge brown, thin, encrusting. Gemmules in compact hemispherical groups of eight t
. Fresh-water biology. Freshwater biology. Fig. 562. Spongilla fragilis. A. Section of group of gemmules; a, curved foraminal tubules, always out- ward; ft, envelop with acerate sjjicules. X 12. 5. Three types of spicules figured here; skeleton spicules, smooth, abruptly pointed; variable parenchymal spicules, subcylindrical, subspined; spined, spherical forms frequently seen throughout the species. X loo. (After Potts.) 8 (7) Tubules of gemmules turned inwards in tlie groups. Spongilla igloviformis Potts 1887. Sponge brown, thin, encrusting. Gemmules in compact hemispherical groups of eight to twelve or more, resting on the fiat side, surrounded by a parenchyma of unequal cells, charged with numerous coarsely spined spicules nearly as long as the rather few, less strongly spined skeleton spicules. On the lower side of timbers in cedar swamps, New Jersey. S. mackayi, described by Carter from Newfoundland, may belong 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
