. Fresh-water biology. Freshwater biology. ioo6 FRESH-WATER BIOLOGY 135 (136) Shell ovate-rhomboid, solid, inflated; beak sculpture very coarse and heavy; pseudocardinals large, solid; laterals very im- perfect or wanting. Subgenus Alasmidonta The type and only species, A. undulata Say (Fig. 1S03: X r'}, is a characteristic shell of the Atlantic states south to North Caro- lina, but is not fount! west of central New Fig. 1503. 136 (137) Shell small, decidedly rhomboid; beak sculpture shghtly corrugated; teeth compressed. Subgenus Pressodon Simpson. The typical species, Alasmidonla
. Fresh-water biology. Freshwater biology. ioo6 FRESH-WATER BIOLOGY 135 (136) Shell ovate-rhomboid, solid, inflated; beak sculpture very coarse and heavy; pseudocardinals large, solid; laterals very im- perfect or wanting. Subgenus Alasmidonta The type and only species, A. undulata Say (Fig. 1S03: X r'}, is a characteristic shell of the Atlantic states south to North Caro- lina, but is not fount! west of central New Fig. 1503. 136 (137) Shell small, decidedly rhomboid; beak sculpture shghtly corrugated; teeth compressed. Subgenus Pressodon Simpson. The typical species, Alasmidonla calceola Lea (Fig. 1504), has a wide distribution through the Northern States from the Mississippi eastward. Several other species occur in the Atlantic and Southeastern States. One species, A. collina Con., is remarl^able for having one or more small spines near the center of each valve. 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
