THE NAUTILUS. 117 



Fig. 6. A. praerosa — Ohio River, Golconda, Ills. 

 Fig. 7-8. A. tintinnabulum Lea — Holston River, Tenn. 

 Fig. 9-10. A. subglobosa Say — Holston River, Tenn. 

 Fig. 11. A. globula Lea? — Holston River, Tenn. 



A NEW SPECIES OF PYRGULOPSIS. 



BY A. A. HINKLEY. 



The finding of a new species of Pyrgulopsis is a surprise, coming 

 as it does from such a well-known stream as the Wabash, a river 

 which has furnished many forms of shells found nowhere else north 

 of the Ohio river, though common in southern streams. There was 

 found associated with the new species Somatogyrus strengi Pilsbry 

 and Walker, a recently described southern species, which adds 

 another to that list of, shall we call it freak geographical distribution? 

 or is there some known cause for the occurence of southern forms in 

 the Wabash ? It seems a little strange that no species of shells bears 

 the name of the Wabash river. The writer thinks now a good time 

 to use the name. 



Pyrgulopsis wabashensis, n. sp. 



The shell is imperforate, pupiform, smooth, horn-colored ; growth 

 lines faint ; composed of five convex whorls separated by an im- 

 pressed suture. The periphery is rounded or slightly angular. The 

 aperture oblique, ovate, angular above, rounded below. The colu- 

 mella a little reflected. Columellar callus thickened; on the 

 parietal wall the outside edge straight and raised. 



Length .12, diam. .06 of an inch. 



Found in shallow water of the Wabash river, at the Chains in 

 Posey county, Indiana, by the writer's son, George Hinkley. Com- 

 pared with P. mississippiinsis this species is smaller, has not the 

 angular or carinate body whorl, the spire is not so acutely conical, 

 and the aperture is not as wide. The mississipiensis is conical with 

 flat whorls ; this species is pupiform with rounded whorls. Some 

 examples of wabashensis have a slight shoulder on the penultimate 

 whorl just above the suture, others have an impressed line on the 

 body whorl a little distance below the suture. 



