. Fresh-water biology. Freshwater biology. MM. Fig. 1154. ChydoTus ovalis. Entire specimen and antennule. Form round or broad oval. Post- abdomen with rounded apex; r2-i5 inarginal denticles. Claws with 2 basal spines, the proximal minute. Color yellow, transparent. Length, 9» to mm.; '(European), mm. Rare; Nebraska. 225 (217) Ventral edge of keel of labrum with one or more teeth. 226 226 (227, 228) With several teeth; short spine at infero-posteal angle of valves. Chydorus harroisi (Richard) 1894. Form and size much like sphaericus, though ventral margin is less curved. Keel of la
. Fresh-water biology. Freshwater biology. MM. Fig. 1154. ChydoTus ovalis. Entire specimen and antennule. Form round or broad oval. Post- abdomen with rounded apex; r2-i5 inarginal denticles. Claws with 2 basal spines, the proximal minute. Color yellow, transparent. Length, 9» to mm.; '(European), mm. Rare; Nebraska. 225 (217) Ventral edge of keel of labrum with one or more teeth. 226 226 (227, 228) With several teeth; short spine at infero-posteal angle of valves. Chydorus harroisi (Richard) 1894. Form and size much like sphaericus, though ventral margin is less curved. Keel of la- brum acuminate behind; serrate, with four or more teeth. Post-abdomen with well-devel- oped pre-anal angle; 10-12 marginal denticles, shortest in middle of row. Color brown-yel- low. Length, 9» ca- o-4 mm. Rare; Lake Charles, Louisiana. Fig. 1155. Chydorus MM. i. 227 (226, 228) With one tooth; infero-posteal spine present. Chydorus hybridus Daday 1905. Similar to harroisi but with only one tooth on keel of labrum. Rare; Wisconsin, Michigan, Louisiana, Texas. Fig. 1156. Chydorus 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
