. Fresh-water biology. Freshwater biology. THE MOLLUSCA 1007 138 (135) Shell thin, triangular, greatly inflated, with a high, sharp posterior ridge; pseudocardinals compressed, reflexed; laterals want- ing. Subgenus Bidlclla Simpson. This group is composed of two very peculiar species found only in South Carolina and Georgia. Type, AlasmidoIlia arcula Lea (Fig. 1506; X t)-. Fig, isotj, 139 (122) Shell small, thin, elongate-elliptical; beak sculpture consisting of fine parallel ridges, looped up in the middle; a high, irregular, compressed pseudocardinal in each valve; laterals nearly or quite
. Fresh-water biology. Freshwater biology. THE MOLLUSCA 1007 138 (135) Shell thin, triangular, greatly inflated, with a high, sharp posterior ridge; pseudocardinals compressed, reflexed; laterals want- ing. Subgenus Bidlclla Simpson. This group is composed of two very peculiar species found only in South Carolina and Georgia. Type, AlasmidoIlia arcula Lea (Fig. 1506; X t)-. Fig, isotj, 139 (122) Shell small, thin, elongate-elliptical; beak sculpture consisting of fine parallel ridges, looped up in the middle; a high, irregular, compressed pseudocardinal in each valve; laterals nearly or quite lacking. Uemilastena Agassiz. The type and only species, H. ambigua Say (Fig. 1507), occurs in the Ohio river system, ranging north to ]\Iichigan, west to Iowa, south to Arkansas, 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
