. The Conchologists' exchange. Mollusks. 18 THE NAUTILUS. Length ; width ; aperture length ; width mill. (Rochester, N. Y.) Length ; width ; aperture length ; width mill. (Rochester, N. Y.) Length ; width ; aperture length ; width mill. (La Porte, Ind.) Length ; width ; aperture length ; width mill. (Chicago.) Animal similar to that of gyrina. Jaw and radula in all respects like those of gyrina. Distribution : eastern and southern states from Maine to Georgia and west to Michigan and Illinois; Southern Canada. Geol
. The Conchologists' exchange. Mollusks. 18 THE NAUTILUS. Length ; width ; aperture length ; width mill. (Rochester, N. Y.) Length ; width ; aperture length ; width mill. (Rochester, N. Y.) Length ; width ; aperture length ; width mill. (La Porte, Ind.) Length ; width ; aperture length ; width mill. (Chicago.) Animal similar to that of gyrina. Jaw and radula in all respects like those of gyrina. Distribution : eastern and southern states from Maine to Georgia and west to Michigan and Illinois; Southern Canada. Geological distribution : Pleistocene ; Loess. Habitat : in ponds and streams, adhering to sticks and stones, and crawling over the muddy bottom. Only a single lot of shells has been found which could be referred to this species and that was collected in the drift along the shore of Lake Michigan at Miller's, Indiana. The nearest typical heteros- tropha have been found living in Pine Lake, La Porte Co., Indiana. It is very probable that this species is not found in any abundance west of Indiana, its place being taken by gyrina, sayii and Integra. Under distribution above, only those states are given from which the writer has seen authentic specimens. Physa Sayil Tappan. Fig. 2. Pliysa sayii Tappan, Amer. Journ. Sci. (1), vol. xxxv, p. 369, pi. iii, fig. 3, 1839. Physa warreniana Lea, Proc. Phil. Acad. Sci., p. 115, 1864. Shell polished, ovate, whorl 5-5^ ; spire elevated, very acute, the whorls moderately convex ; color light horn to light chestnut; sculpture consisting of rather coarse growth lines, crossed by numerous fine, impressed spiral lines, giving the surface of the shell rather a wavy appear- ance, as figured lor gyrina; sutures slightly impressed, bordered as in heterostropha; protoconch consisting of one and a half smooth, glossy whorls of a dark chestnut color ; aperture very large, long oval, three-fourths to four-fifths the length of the whole shell ; peristome thin,
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmollusks, bookyear188
