THE NAUTILUS. 99 



siderable variation in the shape, some examples being almost sub- 

 cylindrical, while others are more inflated toward the shoulder. 

 This is perhaps a sexual difference, and has been noticed in one or 

 two other species. 



SOMATOGYRUS STRENGi Pilsbry and Walker, n. sp. PI. 5, fig. 5. 



Shell small, globose, umbilicate, pale green, smooth, with very fine 

 lines of growth. Spire short, depressed, flattened at the apex. 

 Whorls 3, convex, slightly flattened toward the suture, which is well 

 impressed ; body-whorl large, inflated. Aperture broadly ovate, 

 angled above and rounded below. Lip sharp, somewhat roundly 

 expanded at its juncture with the base of the columella. Columella 

 concave, narrow ; columellar callus flattened, extending over the 

 parietal wall, separated below by a well-defined axial groove. 



Alt. 3, diam. 3 mm. 



Types (No. 22374 Coll. Walker) from the Tennessee River, Flor- 

 ence, Ala. Also Shoal Creek at the same place and Bridgeport, Ala. 

 Cotypes in the collections of the Academy of Natural Sciences and 

 A. A. Hinkley. This very distinct little species was found in con- 

 siderable abundance at both localities at Florence. It is the Ten- 

 nessean analogue x)f the Coosan S. umbilicatiis, but differs in the 

 depressed spire, more inflated form, flattened columella and axial 

 groove. 



A single immature example of this species from Bridgeport, Ala., 

 received from Mr. L. H. Streng, of Grand Rapids, Mich., lias been 

 in the collection of the Academy for several years, but has been 

 withheld from publication until further material could be had. Dr. 

 Pilsbry and myself unite in naming this interesting form after Mr. 

 Streng, who for more than fifty years has been actively interested in 

 conchology, and who is the last survivor of the group of collectors 

 that for many years made Grand Rapids the scientific centre of the 

 State. 



SOMATOGYRUS BIANGULATUS, n. Sp. PI. 5, fig. 6. 



Shell small, obtusely-conic, turbiniform, umbilicate, light greenish - 

 yellow, smooth, lines of growth very fine, spire elevated, flattened at 

 the apex. Whorls 3^, regularly increasing, angularly shouldered 

 above, flattened above and below the shoulder ; body-whorl moder- 

 ately large, biangulate, shoulder flattened, sloping obliquely from the 



