. Fresh-water biology. Freshwater biology. 322 FRESH-WATER BIOLOGY II (12) Hydranth form most frequently seen; medusae rarely found and have but eight Microhydra Potts. But one species, M. ryderi Potts, first described from near Philadel- phia, Pa., but since then found in different locaUties in Europe. The medusae have been seen only when in a very early stage and the adult stages are not known. Fig. sS?. Microhydraryderi. (a) Young medusa. X 40. (After Moore from Potts.) {h) Hydranths and embryo. (J J X 22. (After Ryder from Potts.) 12 (11) Hydranth form rarely seen; medusae have
. Fresh-water biology. Freshwater biology. 322 FRESH-WATER BIOLOGY II (12) Hydranth form most frequently seen; medusae rarely found and have but eight Microhydra Potts. But one species, M. ryderi Potts, first described from near Philadel- phia, Pa., but since then found in different locaUties in Europe. The medusae have been seen only when in a very early stage and the adult stages are not known. Fig. sS?. Microhydraryderi. (a) Young medusa. X 40. (After Moore from Potts.) {h) Hydranths and embryo. (J J X 22. (After Ryder from Potts.) 12 (11) Hydranth form rarely seen; medusae have more than eight tentacles. Craspedacusta Lankester. But one species, C. sowerbyi Lankester, known in Europe and America. Found only in aquaria according to earlier records, but large numbers were collected by Professor H. Gar- man in September, 1916, in a creek near Frankfort, Kentucky, the first record of their occurrence in other than artificial sur- roundings. A second species, C. kawaii Oka, has been found in a river of China. Fig. 588. Craspedacusta sowerbyi. X about 4. (After Hargitt.) Limnocnida Giinther is the only other known genus of fresh-water medusae and its distribution so far as recorded is limited to the Eastern Hemisphere. Limnocnida tanganyicae (Bohm) 1883 is found in Africa; Limnocnida indica Annandale iiji2, in India; Limnocnida rhodesia Boulenger 1912, in southern 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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