. Fresh-water biology. Freshwater biology. MM. Like faviformis in having deep polygonal cuticular cells; but distinguished by the de- velopment of an extraordinary and complex system of thin cuticular ridges, which extend far beyond the ordinary cells. A long horn extends laterally from the middle dorsal region of each valve, from which radiate some of the ridges. $ unknown. Color yellow. Length, 9 , to mm. Maine, New Hampshire, and New Jersey. Fig. 1149. Chydorns bicornutus. (After Doolittle.) 216 (214, 215) Shell of ordinary type 217 217(225) Ventral edge of keel of labrum smooth 218
. Fresh-water biology. Freshwater biology. MM. Like faviformis in having deep polygonal cuticular cells; but distinguished by the de- velopment of an extraordinary and complex system of thin cuticular ridges, which extend far beyond the ordinary cells. A long horn extends laterally from the middle dorsal region of each valve, from which radiate some of the ridges. $ unknown. Color yellow. Length, 9 , to mm. Maine, New Hampshire, and New Jersey. Fig. 1149. Chydorns bicornutus. (After Doolittle.) 216 (214, 215) Shell of ordinary type 217 217(225) Ventral edge of keel of labrum smooth 218 218 (219) Antero-dorsal surface of valves and head flattened. Chydorus gibbus LiUjeborg 1880. The curve of the dorsal surface somewhat flattened, both in front and behind, making a sort of hump in center of dorsal margin. Valves reticulated. Head small; rostrum projects from valves in characteristic way. Post-abdomen with 8-10 marginal denticles. Color yellowish to brown. Length, J, mm. Lake Superior, Wisconsin, Michigan; rare. This species is C. rugtdosus Forbes. Fig. 1150. 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
