. Fresh-water biology. Freshwater biology. 984 FRESH-WATER BIOLOGY 14 (43, 45) Surface smooth or finely striate Section Torquis Dall. ^ _ _ This group of small species is ot general distributiorL from the At- V'ir^Ks!^-' }—^'J lantic to the Pacific. Type, Planorbis parvus Say, (Fig. 1433; X 4J). FlO. 1433- 45 (43, 44) Shell minute; surface costate. . Section Armiger Hartmann. "M The typical species only, Planorbis crista L., (Fig. 1434; X 7), repre- sents this group in our fauna and has been recorded from Maine to Illi- nois and northward. ? Fig. i«4. 46 (34) Aperture with one or more set
. Fresh-water biology. Freshwater biology. 984 FRESH-WATER BIOLOGY 14 (43, 45) Surface smooth or finely striate Section Torquis Dall. ^ _ _ This group of small species is ot general distributiorL from the At- V'ir^Ks!^-' }—^'J lantic to the Pacific. Type, Planorbis parvus Say, (Fig. 1433; X 4J). FlO. 1433- 45 (43, 44) Shell minute; surface costate. . Section Armiger Hartmann. "M The typical species only, Planorbis crista L., (Fig. 1434; X 7), repre- sents this group in our fauna and has been recorded from Maine to Illi- nois and northward. ? Fig. i«4. 46 (34) Aperture with one or more sets of laminae or teeth behind the margin. Segmentina Fleming. The typical Segmentinae are not represented in our fauna. All of the American species belong to the subgenus Planorbula Haldeman. The type 5. armigera Say, (Fig. 143s; X 2) is common in the northern Eastern States and Canada. Fig. 143s. 47 (33) Shell spiral, dextral, flattened above and convex below; body-whorl very large Subfamily Pompholiginae . 48 48 (49) Shell imperforate Pompholyx Lea. ^>'^, Two or three species only are known from California. Type, P. effusa --.^yV) Lea., (Fig. 1436; X 2i). Fig. 1436. 49 (48) Shell deeply umbilicate Carinifex W. G. Binney. A\\\W ) The typical species, C. »ejo6«rAyj Lea., (Fig. 1437), is from Cali- '>'\ ^'Yi/' / fornia. Fig. 1437. S° (S3) Shell spiral, sinistral. Animal sinistral; tentacles slender, cylindrical. Family Physidae . 51. 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
