. Fresh-water biology. Freshwater biology. MM. 127 (126) Post-abdomen with 20-30 marginal denticles. Camptocercus macrurus (O. F. Miiller) 1785. Much Uke the preceding. Very rare, but reported from most regions in the United States. Undoubtedly the preceding species has been mistaken for this by some observers. 128 (125) Crest on valves only. Kurzia Dybowski and Grochowski 1894. This genus is Alonopsis (part) of older authors; Pseudalona Sars, Sole American species Kurzia latissima (Kurz) General form subguadrate; greatly compressed; but with only slight crest on back, none on head.
. Fresh-water biology. Freshwater biology. MM. 127 (126) Post-abdomen with 20-30 marginal denticles. Camptocercus macrurus (O. F. Miiller) 1785. Much Uke the preceding. Very rare, but reported from most regions in the United States. Undoubtedly the preceding species has been mistaken for this by some observers. 128 (125) Crest on valves only. Kurzia Dybowski and Grochowski 1894. This genus is Alonopsis (part) of older authors; Pseudalona Sars, Sole American species Kurzia latissima (Kurz) General form subguadrate; greatly compressed; but with only slight crest on back, none on head. Head small, the rostrum reaching not much below middle of valves, though longer than antennules. Post-abdomen long, slender; lower angle usually produced into a lobe; 10-12 marginal denticles. Claws of Camptocercus type. $ Uke 9; rostrum shorter; post- abdomen with small denticles; vas deferens opens on ventral (upper) side; strong hook on first foot. Color yellowish, transparent. Length, $, mm.; $, mm. Found in all regions among weeds in pools or lakes. Fig. 1120. Kurzia latissima. 129 (124, 132) Crest on head and valves; post-abdomen broad, without marginal denticles. . Acroperus Baird 1843 . 130 Body thin, compressed; crest on head and back. Valves subquadrate, obliquely striated; infero-posteal angle rounded or acute, usually with teeth. Post-abdomen large, compressed; without marginal denticles but with lateral row of squamae. Claws long, straight, with i basal spine and secondary denticles, much as in Camptocercus. Intestine with large intestinal cecum. £ye larger than ocellus. Color 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
