Fossil Freshwater Mollusks From Oregon Contained in the Condon Museum of the Un

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Fossil Freshwater Mollusks From Oregon Contained in the Condon Museum of the Un
G Dallas Hanna
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SP. Plate 1, figures 8 and 9 Shell ovate, the apex about one-third the distance from the anterior end. Spire elevated and acutely pointed, both inside and outside. Sculpture consists of rough irregular growth ridges, no radial markings; the irregularities of the outside are visible on the inside as concentric ridges of uneven strength. Length, 17. 5 mm. ; width, 14. 5 mm. ; height, 8. 7 mm.
Type No. 18 University of Oregon. Cast of same, No. 673, Mus. California Acad. Sci.
Type from University
...of Oregon locality 210, Warner Lake beds, eastern Oregon. Pleistocene.
This singular species is the largest of North American fresh- water limpets. The collection at the type locality, where it is fairly common, contains one imperfect specimen which is more than 22 millimeters long; the type is of only average size. The [91 Fossil Freshwater MoUusks. From Oreg. Cn closest relative of the species is Lanx undulate (Meek)' described from the Kaw-Sow Mountains, Nevada. That species, however, has distinct undulations on the posterior slope and the anterior slope is more decidedly concave.


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