. Fresh-water biology. Freshwater biology. ioi8 FRESH-WATER BIOLOGY 165 (104) Interior of shell non-nacreous or porcellanous, or the whole shell of a prevailing prismatic substance. 166 Five families: i66, 167, 168, 173, 174. 166 (167) Shell of a prevailing prismatic substance, mytiliform, very in- equilateral; beaks compressed, terminal; ligament subinter- nal; anterior adductor and pedal protractor muscles inserted on a septum in the beak. Byssiferous. Family Dreissensiidae. Only one genus. Congeria Partsch. Represented in our fauna by two species. Example, C. IciiLOpliacala Con. [¥\g. 1527;

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. Fresh-water biology. Freshwater biology. ioi8 FRESH-WATER BIOLOGY 165 (104) Interior of shell non-nacreous or porcellanous, or the whole shell of a prevailing prismatic substance. 166 Five families: i66, 167, 168, 173, 174. 166 (167) Shell of a prevailing prismatic substance, mytiliform, very in- equilateral; beaks compressed, terminal; ligament subinter- nal; anterior adductor and pedal protractor muscles inserted on a septum in the beak. Byssiferous. Family Dreissensiidae. Only one genus. Congeria Partsch. Represented in our fauna by two species. Example, C. IciiLOpliacala Con. [¥\g. 1527; X 2), found on the Atlantic coast from Maryland 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