The Lymnaeidae of North and Middle America; Recent and Fossil (Paperback)

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...Austral life zones, east of the Appalachian Mountains. It is characteristic of the Carolinian region. Like many plants, it has extended its range into southern New Jersey. RECORDS. New Jersey: Mouth of Woodbury Creek, and in tide meadow ditch at Washington Park near Gloucester, Camden Co. (J. A. Allen). South Carolina: South Carolina (Gibbs; Say); Charleston, S. C. (Lewis; Walker); Charleston, S. C., collected in 1865 in a low lot in Alexander Street near Chapel, only four or five blocks from the center of the city (now filled up and destroyed); Sullivan's Island, four miles from the city (Mazyck). Geological Range: Unknown. Ecology: In tide meadow ditch and at mouth of creek (Allen, New Jersey); in vacant lots and in ditches (Mazyck, South Carolina). Remarks: Humilis may be known by its acute spire, convex whorls, obese body whorl and narrow, somewhat triangular inner lip, which is not notably appressed at its junction with the parietal wall but forms an evenly rounded expansion. It greatly resembles umbilicata, but may be distinguished by the inner lip which, in umbilicata, forms a broad, triangular excavated expansion reaching to the base of the aperture, while in humilis the lower part of the inner lip is turned upward and not backward. Humilis has also a mere obese body whorl. The formation of the inner lip of the two species is quite different and no difficulty will be encountered in distinguishing the two forms if this point is observed. The shape of the inner lip is also different in parva, sterkii and the other related species. Until recently Say's humilis was believed to be one of the best known as well as one of the commonest of American Lymnaeas. At present it may be said to be one of the rarest and least known. Mr. Bryant...