. Fresh-water biology. Freshwater biology. 714 FRESH-WATER BIOLOGY no (in) Post-abdomen not bilobed. Macrothrix laticornis {Juiiae) 1820. Form round-ovate. Valves crested, the dorsal edge serrate with fine teeth. Head evenly rounded. Labrum with large triangular process. Antennule broader distally; a setiferous projec- tion on posterior margin near apex; anterior margin with several fine in- cisions and clusters or rows of hairs; olfactory setae conspicuously unequal. Post-abdomen with numerous fine spines and hairs; anus terminal. Claws small. Color grayish white or yellowish. Length, 9 • °-S
. Fresh-water biology. Freshwater biology. 714 FRESH-WATER BIOLOGY no (in) Post-abdomen not bilobed. Macrothrix laticornis {Juiiae) 1820. Form round-ovate. Valves crested, the dorsal edge serrate with fine teeth. Head evenly rounded. Labrum with large triangular process. Antennule broader distally; a setiferous projec- tion on posterior margin near apex; anterior margin with several fine in- cisions and clusters or rows of hairs; olfactory setae conspicuously unequal. Post-abdomen with numerous fine spines and hairs; anus terminal. Claws small. Color grayish white or yellowish. Length, 9 • °-S-0-7 mm.; $, mm. Widely distributed; found in all parts of the country but nowhere very Fig. 1112. Macrolhrix laHcornis, MM III (no) Post-abdomen bilobed 112 (113) Conspicuous fold or folds of shell of head at cervical sinus. Macrothrix montana Birge 1904. Form ovoid. Head large; dorsal margin evenly rounded; the shell extended into collar-like folds in front of cervical sinus. Antennules stout, large, enlarged near apex, about 6 anterior cross-rows of hairs, and 3-4 stouter posterior setae; olfactory setae unequal. Post-abdomen bilobed. Claws hardly larger than spines. Color transparent, in preserved speci- mens. $ unknown. Length, 9, ca. mm. Colorado. Fig. 1113. Macrothrix 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
