STROBILOPS, CANADA AND UNITED STATES. 29 



4. Strobilops ^nea Pilsbry. PL 3, figs. 6-12. 



The shell is narrowly lunbilicate, the width of umbilicus 

 contained about 6I/2 times in the diameter of the shell, low- 

 conic, with obtuse, rounded summit, the periphery distinctly 

 tut hluntly angular. The base is somewhat fattened helow 

 the periphery, elsewhere moderately convex. Whorls 5%, 

 convex, slowly increasing, the first 1% smooth, corneous, the 

 rest dark brown with a red-gold gleam ; sculptured with nar- 

 row riblets which are somewhat oblique, retractive, rather fine 

 and close. The base is smoothish, marked with growth-striae 

 only, except on its last third, where the riblets of the upper 

 surface continue over the base. The aperture is semilunar, 

 low but wide. Outer and basal lips brown, well expanded, 

 somewhat thickened, the columellar margin dilated. The 

 parietal lamella emerges to the edge of the parietal callus, 

 penetrating inward a half whorl, Infraparietal lamella weakly 

 emerging. Midway between the lamella there is a very weak, 

 low, deeply-placed interparietal lamella. These lamellae are 

 nodose far within, the nodes roughened, shortly prickly (PL 

 3, fig. 10; pi. 4, fig. 2). The internal barrier, situated one- 

 third of a whorl from the aperture, is radial, but slightly 

 oblique (fig. 12) ; it consists of a short, weak columellar fold 

 and four basal folds, visible through the shell ; the second and 

 fourth folds from the axis are long, the first short, the third 

 fold weak or sometimes wanting; there is no fold above the 

 periphery. 



Height 2, diam. 2.7 mm. Paratype. 



Height 1.9, diam. 2.75 mm. Type, fig. 6. 



Height 1.5, diam. 2.4 mm. Randolph Co., Ala. 



Massachusetts to Michigan, Illinois and Arkansas, south to 

 southern Florida and Louisiana. Type loc, Cazenovia, N. Y. 

 Localities of specimens examined follow: Massachusetts: Mt. 

 Holyoke (A. D. Bro\\ai). New York: Cazenovia (Henderson, 

 Walker, Clapp and Pilsbry, 1905) ; Lanesville and Llarble- 

 town (Van Ingen). New Jersey: Burlington Co. Bayard 

 Long). Pennsylvania: Philadelphia; Chester Co. (B. Long) ; 

 Berks Co. (Pilsbry) ; York Furnace (W. Stone). Delaware: 

 Delaware City and Dover (S. N. Rhoads). Maryland: Great 



