. Fresh-water biology. Freshwater biology. 192 (191) Bodies elongate-ovate; peristomal disk not broad, elevated a con- siderable distance . Opercularia Stein. Representative species. . Opercularia plicatilis Stokes 1884. Bodies elongate-ovate, smooth, soft and flexible, about three times as long as broad. When contracted, zooids are thrown into transverse folds posteriorly and bear longitudinally plicate, snout-like projections in front. Protoplasm enclosing green corpuscles. Ciliary circles two. Stalk rigid, striate longitudinally. Zooids in sessile groups of from ten to twenty. Length of bod
. Fresh-water biology. Freshwater biology. 192 (191) Bodies elongate-ovate; peristomal disk not broad, elevated a con- siderable distance . Opercularia Stein. Representative species. . Opercularia plicatilis Stokes 1884. Bodies elongate-ovate, smooth, soft and flexible, about three times as long as broad. When contracted, zooids are thrown into transverse folds posteriorly and bear longitudinally plicate, snout-like projections in front. Protoplasm enclosing green corpuscles. Ciliary circles two. Stalk rigid, striate longitudinally. Zooids in sessile groups of from ten to twenty. Length of body 250 li. Height of colony mm. At- tached to plants in pond Fig. 545. 'Opercularia plicatilis. X 25. (After Stokes.) 193 (170) With a lorica 194 194 (197) Lorica gelatinous 195. 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
