. Fresh-water biology. Freshwater biology. THE MOLLUSCA 1005 132 (131, 133) Shell subrhomboid, compressed, posterior slope corrugated; lateral teeth subobsolete. Subgenus Lasmigona Rafinesque. The type and only species, Sywphyuolii costala Raf. {Fig. 1501; X 5), is common in the St, Lawrence and IMississippi draina^^c 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
. Fresh-water biology. Freshwater biology. THE MOLLUSCA 1005 132 (131, 133) Shell subrhomboid, compressed, posterior slope corrugated; lateral teeth subobsolete. Subgenus Lasmigona Rafinesque. The type and only species, Sywphyuolii costala Raf. {Fig. 1501; X 5), is common in the St, Lawrence and IMississippi draina^^c 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 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
