NEW FRESH-WATER SHELLS FROM THE OZARK MOUNTAINS. By Anson A. Hinkley, Of Dubois, Illinois. During August, 1914, the writer spent two weeks collecting in the Ozark region, chiefly at Galena, Missouri ; Cotter, Norfolk, and Black Rock, Arkansas. An interesting series of fresh-water species was obtained, of which several appear to be new. Descriptions of these are given below with a list of the species collected. ANCULOSA ARKANSENSIS, new species. Plate 78, fig. 3. Shell smooth, conical; whorls five, convex; suture impressed. Aperture large, oval; labrum straight, a shght sinus at the base of the columella; columellar callus brown, thick and curved across the parietal wall, shghtly indented in the umbilical region. Shell yellow-ish or straw-color externally with six faint, narrow, brownish bands, showing the same in the aperture. The type. Cat. No. 271764, U.S.N.M., measures: Height, 10 mm,; diameter, 7 mm. This species was found in the North Fork of Wiiite River 2 or 3 miles above Norfolk, Arkansas. A very few were taken at Cotter, Arkansas. This is the first Anculosa known from west of the Mississippi River. Compared with A. subglohosa, it is smaller, spire more produced, aperture not as wide. It is nearer to A. virgata but is smaller, more sohd, lighter colored, and has the character of the bands different when present. The more elevated specimens resemble short wide forms of Gonioha-sis pleheius, but that species has an angular body-whorl and differs in the aperture and callus. The difference is strongly marked in the young specimens. The young ^. arkansensis has a striking resemblance to some of the species of Somatogyrus. An occasional specimen has two broad bands with a hght zone between of about the same width. A light-colored band below the suture is shown on many specimens. Proceedings U. S. National Museum, Vol. 49— No. 2126. 587
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