. Fresh-water biology. Freshwater biology. Fig, 1517- 155 (154) Shell elliptical; beaks anterior. Subgenus Pseudoon Simpson. Two species only. The type, Obovaria ellipsis Lea {Fig. 1518; X 3), ranges from the upper Mississippi and lower Great Lakes south to Tennessee and Arkansas. The other is found from Arkansas to Louisiana and east to 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, 1865-194

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. Fresh-water biology. Freshwater biology. Fig, 1517- 155 (154) Shell elliptical; beaks anterior. Subgenus Pseudoon Simpson. Two species only. The type, Obovaria ellipsis Lea {Fig. 1518; X 3), ranges from the upper Mississippi and lower Great Lakes south to Tennessee and Arkansas. The other is found from Arkansas to Louisiana and east to 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