. Fresh-water biology. Freshwater biology. THE WATER FLEAS (CLADOCERA) 709 lar^e, some distance from apex of rostrum. Intestine convoluted, with small hepatic ceca. J with hook on first foot; vas deferens opens near claws. Length, J, to mm. Color transparent-yellowish. Maine. New Hampshire; among weeds in lakes. The difference in antennary setae of I and 9 holds for all specimens hitherto MM Fig. iioi. Parophryoxus lubulatus. (After Doolittle.) 89 (88) Strehlocerus Sars 1862 90 Setae : animal small, spherical. 1-1-3 Body round-oval, not compressed or crested. Labrum with large,
. Fresh-water biology. Freshwater biology. THE WATER FLEAS (CLADOCERA) 709 lar^e, some distance from apex of rostrum. Intestine convoluted, with small hepatic ceca. J with hook on first foot; vas deferens opens near claws. Length, J, to mm. Color transparent-yellowish. Maine. New Hampshire; among weeds in lakes. The difference in antennary setae of I and 9 holds for all specimens hitherto MM Fig. iioi. Parophryoxus lubulatus. (After Doolittle.) 89 (88) Strehlocerus Sars 1862 90 Setae : animal small, spherical. 1-1-3 Body round-oval, not compressed or crested. Labrum with large, serrate, acute process. AnteimulesMarge, flat, bent, or rather twisted, broadened in distal part; with lateral sense- hair near base, several hairs on posterior face, rows of fine hairs, and subequal olfactory setae. Post-abdomen bilobed; the pre-anal part compressed, semi-circular; the anal part rounded^ with fine spines or hairs. Claws small, curved, with several equal minute denticles on con- cave edge. Five pairs of feet. Intestine convoluted, with small hepatic ceca. $ (European, of 5. serricaudatus) small, triangular, much Uke $ ; first foot without hook. 90 (91) Dorsal margin of valves smooth. Strehlocerus serricaudatus (Fischer) 1849. ^_^ . Pre-anal part of post-abdo- men with serrate margin and bearing rows of fine hairs. Anterior margin of antennule somewhat toothed. Color whitish-opaque to yellowish. Length, 9> ca. mm.; $, ca. mm. Rare but widely distributed in weedy pools and margins of lakes. Reported from New England, Wisconsin, Nebraska, Louisiana, Colorado, Califor- 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
