rilE NAUTILUS. 31 



jellowish brown, glossy, finely rib-striate above and below; umbili- 

 ■cate. Spire low dome-shaped. Whorls about 6, very closely coiled, 

 the last having the periphery situated high ; a trifle detlexed in front. 

 Aperture oblique, lunate ; peristome white, narrowly reflexed, thick- 

 ened within, the outer lip bearing a small, squarish tubercle, bent 

 inward ; basal lip bearing a marginal tubercle, abrupt on its outer, 

 sloping or buttressed on its inner side. Parietal lamella short, erect, 

 a trifle curved. Alt. G, diam. 11^ mm. 



Auburn, Alabama. Types no. 82556 A. N. S. P., collected by 

 Carl F. Baker. 



The aperture is exceedingly similar to that of P. injlecta, from 

 which this species differs in the sculpture, closely coiled whorls and 

 open umbilicus. P. cragini is more depressed, with fewer whorls. 

 P. vannoslrandi has difl^erently proportioned teeth and less closely 

 coiled whorls. 



Polygyra texnsensis n. sp. 



Shell narrowly umbilicate, but the umbilicus rapidly enlarging at 

 the last whorl, where it becomes more than one-fourth the diameter 

 of the shell ; depressed, light brown, glossy, lightly and rather dis- 

 tantly striate, usually with several coarse, strong wrinkles behind 

 the lip. Spire low, convex. Whorls 5^, slightly convex, slowly 

 widening, the last abruptly descending in front, deeply and narrowly 

 constricted behind the lip, convex beneath. Aperture small, oblique; 

 peristome reflexed, thickened, the outer and basal lips each bearing 

 a compressed tooth, parietal wall with a strong, erect V-shaped 

 tooth which connects the ends of the lip, the upper branch of the V 

 slender and low. 



Alt. 5, diam. 13.5 mm. 



Alt. 5, diam. 12.3 mm. 



Colorado City, Mitchell Co., Texas. Types no. 83258, A. N. S. 

 P., collected by J. H. Ferriss, 1902. 



This species is clearly related to P. texasiana (Moricand), which 

 occurs at the same locality, as well as throughout the greater part of 

 Texas. It differs from texasiana in the larger size, with about the 

 same number of whorls, the more regular increase of the whorls in 

 width, and the proportionally wider umbilicus. In the great num- 

 ber of P. texasiana I have seen from many localities, none approach 

 P. texasensis. 



