. Fresh-water biology. Freshwater biology. Fig. 1501. 133 (131. 132) Shell large, ovate-rhomboid, subcompresscd, smooth; hinge very heavy; lateral teeth imperfectly developed. Subgenus Plcrosystia Rafinesque. Only one species, Sy}nphy}wla complanata Bar. (;. 1502; X?.), which has a wide range from the Great Lakes and the upper JNIississippi south into Alabama and Fig. 1502. 134 (139) Shell rhomboidal, inflated, with a well-developed posterior ridge; pseudocardinals well developed; laterals subobsolete or wanting Alasmidonta Say 135 Four subgenera: 135, 136, 137, Please not

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. Fresh-water biology. Freshwater biology. Fig. 1501. 133 (131. 132) Shell large, ovate-rhomboid, subcompresscd, smooth; hinge very heavy; lateral teeth imperfectly developed. Subgenus Plcrosystia Rafinesque. Only one species, Sy}nphy}wla complanata Bar. (;. 1502; X?.), which has a wide range from the Great Lakes and the upper JNIississippi south into Alabama and Fig. 1502. 134 (139) Shell rhomboidal, inflated, with a well-developed posterior ridge; pseudocardinals well developed; laterals subobsolete or wanting Alasmidonta Say 135 Four subgenera: 135, 136, 137, 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