Manual of Conchology; Structural and Systematic. With Illustrations of the Species Volume 3

by George Washington Tryon

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. 1881 edition. ...inch. The lip is less thickened than the typical B. castanewm. The above is a copy of Da1l's description. I am unacquainted with the species. Shell thin, whorls six to eight, not very convex, flattened near the suture, and generally smoother than in any other species; longitudinal folds, when they exist, ten to fifteen, straight, extending very little below the suture; primary spiral ridges rounded, not flattened, very narrow and distant, about fourteen on the lower whorl, often obsolete, but sometimes sufliciently prominent to form angles rather than ridges; secondary ridges, when present about five to each primary ridge and groove taken together. Colors bright but variable, usually bluish with chestnut.brown revolving lines or series of spots or sometimes brown with white spots. Periostraca smooth or short.ciliated. Length, 1-23 inches. Greenland, Norway, Lapland, Behring's Straits. An arctic species; occurs fossil in the pleistocene of Riviere.' du.Loup, Canada. A number of authors apply to this shell the name Grcenlandicum, Chemn., which I do not adopt because Chemnitz was not a binomial writer, and Grosnlandicum is only a portion of his compound designation of the species. I figure a variety patula, Sars. (fig. 332), which appears to correspond with the dwarf variety of Stimpson; also Neptunea Baerii, Midd. (fig. 377), which is a marked, short, convex variety. The following species described by Hancock, are all synonymous with cyaneum, B. hydrophcmum, Hanc. (figs. Hane. (figs. 336-338, 378). Mr. W. H. Dall adds to the synonymy Volutharpa Miirchiana, Fischer, a short-spired variety(fig. 379), and B. perdix, Beck, to which I agree, the latter being very probably the same as B. Finmarkianum, Verkruzen (figs....

112 pages, Paperback

Published September 13, 2013

About the author

1838-1888

American malacologist

Sometimes published as George Washinton Tryon Jr.