1903.] NATURAL SCIENCES OF PHILADELPHIA. 769 



Guppya micra n. sp. PI. XLIX, figs. 5, 5a, 56. 



Shell distinctly perforate, low-trochoidal, the spire low conic, 

 obtuse at the summit, periphery rounded, the base convex; yellow- 

 ish, slightly transparent, nearly smooth. Whorls 4^, quite convex, 

 slowly and regularh' increasing, parted b}^ a well-impressed suture. 

 Aperture lunate, only slightly oblique, the columellar margin dilated. 

 Alt. 1.5, diam. 2 mm. 



Patzcuaro, Michoacan. Types No. 85,913, A. N. S. P., collected 

 by 8. N. Rhoads, 1899. Also caiion 4 miles west of Mctoria, 

 Tamaulipas. 



ENDODONTID.E. 

 Pyramidula victoriana n. sp. PI. XLIX, figs. 1, la, 16. 



Shell depressed, discoidal, the spire flat, base convex, openly umbili- 

 cate, the width of umbilicus contained about 34- times in that of the 

 shell; thin, greenish corneous. Surface closely and regularly sculp- 

 tured with oblique, thread-like riblets, following the direction of 

 growth-lines. Whorls 3^, the last double the width of the preceding, 

 rounded at the periphery. Aperture oblique, subcircular, about one- 

 fifth or one-sixth of the circle excised by the preceding whorl ; peristome 

 thin and simple, the ends converging. 



Alt. 1.4, diam. 3.4 mm. 



Alt. 1.5, diam. 4 mm.; whorls 3|. 



Cafion 4 miles west of A'ictoria, State of Tamaulipas. Types No. 

 85,907, A. N. S. P. Also in chaparral near Victoria. 



Quite unlike any North American species in the wide last whorl 

 and flat spire, as well as the nearly round mouth. It has the sculpture 

 of Pyramidula, and is probably a member of that genus. The only 

 fresh specimen is figured, and probably is not quite mature. Another 

 bleached and imperfect one is larger, with a fourth of a whorl more. 

 Four specimens were taken. 



Sphyradium polvonense (Pils.). 



Pupa polvonensis Pilsbrv, Proc. Acad. Xat. Sci. Phila., 1894, p. 31, PI. I, 

 fig. 11. 



Shell openly perforate, sul)cylindric, a little tapering upward, the 

 summit rounded. Whitish above, with some narrow dark streaks, the 

 last whorl or two olivaceous-brown, with narrow darker and light 

 oblique streaks. Surface shining, faintly marked with fine growth 

 lines only. Whorls 5^ or 6, slightly convex, the last very convex 

 beneath. Aperture quite oblique, truncate-ovate. Outer lip thin 

 and simple; columellar lip Ijroadly dilated above. Length 2.5, diam. 

 1.3 mm. 

 49 



