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 



