. Fresh-water biology. Freshwater biology. THE MOLLUSCA 987 65 (66) Shell large, globose-turbinate; umbilicate; operculum corneus, con- centric. Animal with the respiratory chamber divided into two parts, one being the lung and the other containing a gill. Family Ampullaeiidae. Only a single genus Ampullaria The Ampullarias are the largest of our fresh- water snails. Two or three species occur in Georgia and Florida. Example, A. paludosa Say, (Fig. 1448). Fio. 1448. 66 (71) Shell of moderate size, dextral, turbinate, imperforate, or subperforate; operculum corneus. Animal branchifero
. Fresh-water biology. Freshwater biology. THE MOLLUSCA 987 65 (66) Shell large, globose-turbinate; umbilicate; operculum corneus, con- centric. Animal with the respiratory chamber divided into two parts, one being the lung and the other containing a gill. Family Ampullaeiidae. Only a single genus Ampullaria The Ampullarias are the largest of our fresh- water snails. Two or three species occur in Georgia and Florida. Example, A. paludosa Say, (Fig. 1448). Fio. 1448. 66 (71) Shell of moderate size, dextral, turbinate, imperforate, or subperforate; operculum corneus. Animal branchiferous. Family Viviparidae . 67 Four genera: 67, 68, 69, 70 67 (68) Shell rather thin; operculum concentric, inner margin simple. Animal with foot of moderate size, not produced beyond the snout. Teeth of the radula multicuspid. . Viviparus 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
