. Fresh-water biology. Freshwater biology. This group of large, striking species is confined to the rivers of east- em Tennessee. They are found only in very rapidly running water. Example, /. spinosa Lea (Fig. 1469).. Fig. 1469. 92 (94) Shell globose-conic; columella callously thickened above and below; aperture shortly channeled below. Lithasia Haledman . 93 The Lilhasiae form a very distinct group characterized by the colu- mella thickened by deposits of callus above and below and the short canal at its base. With the exception of three species, which extend as far north as the Wabash River
. Fresh-water biology. Freshwater biology. This group of large, striking species is confined to the rivers of east- em Tennessee. They are found only in very rapidly running water. Example, /. spinosa Lea (Fig. 1469).. Fig. 1469. 92 (94) Shell globose-conic; columella callously thickened above and below; aperture shortly channeled below. Lithasia Haledman . 93 The Lilhasiae form a very distinct group characterized by the colu- mella thickened by deposits of callus above and below and the short canal at its base. With the exception of three species, which extend as far north as the Wabash River, Indiana, the group is restricted to Ken- tucky, Tennessee, and Alabama. Type, L. geniculala Con. (Fig. 1470). Fig. 1470. y3 Shell similar to Lithasia, but with the basal canal more produced. Section Angitrema Haledman. This group connects Lithasia with lo. Type, Lithasia armigera Say (Fig. 1471). Fig. 1471. 94 (95) Shell obovate, thick, soHd; spire short; body-whorl large; columella callously thickened above, incurved below and sub truncate. Eurycaelon Lea. This genus, when restricted to the species grouping about the type, is confined to the rivers of the Tennessee drainage system. Type, E. anthmyi Budd (Fig. 1472).. 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
