. The Conchologists' exchange. Mollusks. THE NAUTILUS. 105 Duchess Co., New York (W. S. Teator); Post Pliocene at White Pond, New Jerse}^ (Dr Joseph Leidy); and Saginaw Bay, Michigan (Prof. M. Miles.) Differs from V. t. simj^Iex Gld by having a basal carina and from V. t. confusa Wkr, by lacking a keel at the shoulder. Valvata tricarinata basalts n. var. figs. 3, 4. Shell discoidal, thin, translucent, greyish corneous, spire truncate, slightly elevated, apex impressed, suture linear, shal- low\ Whorls 3J, the first ones with a median carina, body- whorl slightly descending at the aperture, wit
. The Conchologists' exchange. Mollusks. THE NAUTILUS. 105 Duchess Co., New York (W. S. Teator); Post Pliocene at White Pond, New Jerse}^ (Dr Joseph Leidy); and Saginaw Bay, Michigan (Prof. M. Miles.) Differs from V. t. simj^Iex Gld by having a basal carina and from V. t. confusa Wkr, by lacking a keel at the shoulder. Valvata tricarinata basalts n. var. figs. 3, 4. Shell discoidal, thin, translucent, greyish corneous, spire truncate, slightly elevated, apex impressed, suture linear, shal- low\ Whorls 3J, the first ones with a median carina, body- whorl slightly descending at the aperture, with two strong carinse, the upper surface between the suture and the shoulder keel flat, slightly convex between this and the peripheral ca- rina, base evenly rounded to the rather large deep umbilicus, surface rather dull, sculptured with irregular growth strise. Aperture irregularly truncate orbicular, lip thin, angular at the suture, upper carina and peripheral keel ; base and colum- ella evenly arcuate, upper lip straight. Alt. diam. , apert. alt. , diam. Type in the collection of the Academ}" of Natural Sciences number 11995 from the Hudson River, New York (W. M. Gabb). Also in the collection from Vermont (J. S. Phillips). Differs from V. tricarinata Saj^ by lacking the basal carina, and from V. t. confusa Wkr. by the absence of a basal keel and in having a peripheral 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 Averell, William D. Philadelphia, Wm. D. Averell
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmollusks, bookyear188
