. Fresh-water biology. Freshwater biology. 127 (128) .--* y A single species, f^ea (Fig. 1497), from the Cum- berland and Tennessee river systems, is the only one known. Fig. 1497. 128 (129) Shell large, inflated, subrhomboidal, with two radiating rows of knobs; beak sculpture coarse, continuous with that of the surface which consists of oblique folds and wrinkles; pseudo- cardinals large; laterals short and blurred. Arcidens Simpson. The typical and only species,/I. confragosa Say (Fig. 149S; X 5), is common throughout the Ohio and Mississippi drainage systems and southwest to Texas.

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. Fresh-water biology. Freshwater biology. 127 (128) .--* y A single species, f^ea (Fig. 1497), from the Cum- berland and Tennessee river systems, is the only one known. Fig. 1497. 128 (129) Shell large, inflated, subrhomboidal, with two radiating rows of knobs; beak sculpture coarse, continuous with that of the surface which consists of oblique folds and wrinkles; pseudo- cardinals large; laterals short and blurred. Arcidens Simpson. The typical and only species,/I. confragosa Say (Fig. 149S; X 5), is common throughout the Ohio and Mississippi drainage systems and southwest to Fig. 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