. Fresh-water biology. Freshwater biology. ^36 FRESH-WATER BIOLOGY 174 (173) Spicules siliceous, in the form of plates and delicate radiating spines. ... Acanthocystis Carter. Representative species Acanthocystis chaetophora Leidy The skeletal plates are oval, arranged tangentially. The spinous rays are of two lengths, the long ones acutely forked, the short ones widely forked at the distal extremities. Nucleus large, usually no contractile vacuole. Endoplasm green in color from enclosed chlorophyl. Habitat among aquatic — plants. Diameter of body 50 to 60 11. y'1^///0'h'\\Kk.^-^-.^~' F
. Fresh-water biology. Freshwater biology. ^36 FRESH-WATER BIOLOGY 174 (173) Spicules siliceous, in the form of plates and delicate radiating spines. ... Acanthocystis Carter. Representative species Acanthocystis chaetophora Leidy The skeletal plates are oval, arranged tangentially. The spinous rays are of two lengths, the long ones acutely forked, the short ones widely forked at the distal extremities. Nucleus large, usually no contractile vacuole. Endoplasm green in color from enclosed chlorophyl. Habitat among aquatic — plants. Diameter of body 50 to 60 11. y'1^///0'h'\\Kk.^-^-.^~' Fig. 360. Acanthocystis chaetophora. X 250. (After Leidy.) 175 (168) With a solid envelop, perforated for the pseudopodia. Sometimes stalked. . .... Order Desmothoraca. One genus reported in North America. . Clathrulina Cienkowsky. Envelop with a stalk. Representative species Clathrulina elegans Cienkowsky 1867. Envelop more or less chitinous, perforated by numerous large, irreg- ular openings. Protoplasm not fiUing the envelop. Nucleus single. One or more contractile vacuoles. Pseudopodia very delicate, appar- ently without axial filaments. Habitat sphagnous swamps and among aquatic plants; very common in some localities. Diameter of envelop 60 to 90 li. Fig. 361. Clathrulina elegans, X 130. (After Leidy.). 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
