. Fresh-water biology. Freshwater biology. 952 FRESH-WATER BIOLOGY S (4) Stock composed of zooids that are sharply separated from one another by partitions; sparsely, usually oppositely branched; with a chitinous cuticula. The zooids are club-shaped and have a lateral, quadrangular aperture near the larger, distal end. Paludicella ehrenbergii van Beneden 1848. Zooids about 2 mm. long; lateral buds partly repent, partly erect; about 16 tentacles. Habitat, flowing streams; occasionally in water pipes. From Massachusetts, Penn- sylvania, Illinois, and Lake Michigan. Fig. 1396. Paludicella ehrenhe
. Fresh-water biology. Freshwater biology. 952 FRESH-WATER BIOLOGY S (4) Stock composed of zooids that are sharply separated from one another by partitions; sparsely, usually oppositely branched; with a chitinous cuticula. The zooids are club-shaped and have a lateral, quadrangular aperture near the larger, distal end. Paludicella ehrenbergii van Beneden 1848. Zooids about 2 mm. long; lateral buds partly repent, partly erect; about 16 tentacles. Habitat, flowing streams; occasionally in water pipes. From Massachusetts, Penn- sylvania, Illinois, and Lake Michigan. Fig. 1396. Paludicella ehrenhergii. (a) Colony, half natural size. (6) Portion of same enlarged. X S. (After Kraepelin.). 6 (3) Zooecia confluent; epistome present. Order Phylactolaemata. 7 7 (14, 15) Statoblasts without hooks, rounded at ends 8 8 (9) Stock branched in form of antlers; more rarely massed with recumbent and elevated tubes; mostly brown or incrusted with algae and grains of sand; rarely hyaline. Fredericella sultana Blumenbach 1774. Tubes cylindrical, the older ones mostly keeled. Without complete dissepiments. Apertures terminal at the broadened or bifid ends of tubes. Polypide very long and slender; tentacles arranged in a nearly circular corona. Few tentacles, not exceeding 24. Statoblasts dark brown, bean-shaped or elliptical, without float, and with smooth upper surface. Habitat on wood, stones and water plants m standing and slowly flowing waters. From Maine to Penn- sylvania, westward to Wisconsin and even Flathead Lake, Montana. Common in the Great Lakes. Fig. 1397. Fredericella sultana, (a) Portion of branch, natural size, (b) Polyp magnified. (After Hyatt.) (c) Statoblast. (After Kraepelin.). 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
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfreshwa, bookyear1918
