42 PUPISOMA. 



face with faint growth-lines and microscopically granulated ; 

 apex obtuse, large, more densely granulated than the body of 

 the shell ; widely umbilicate, with the umbilicus extending to 

 the apex and contained about 5 times in the diameter of the 

 shell. Aperture well rounded, slightly oblique; lip thin, 

 partly reflected around the umbilicus. The type measures, 

 alt. 1.5, diam. 1.38, umbilicus 0.29 mm. (Clapp). 



Length 1.3, diam. 1.25 mm.; 3~y 2 whorls (cotype). 



Alabama: Magazine Point, 8 miles north of Mobile. Also 

 found at Spring Hill and along the Fowl Eiver, about 3 miles 

 from the coast in the southern part of Mobile Co. (L. H. 

 McNeill). 



Thysanophora macneilli CLAPP, Nautilus, xxxi, Jan. 1918, 

 p. 74, pi. 8, f. 1. 



In the cotype figured the umbilicus is contained 5% times 

 in the diameter. Dr. Clapp 's figure shows 3^2 whorls, and 

 this is the number counted in the cotype figured. The um- 

 bilicus is larger than in P. minus and the aperture is less 

 oblique, this being particularly noticeable in a basal or a 

 profile view. 



20. PUPISOMA MEDIAMERICANUM n. sp. PI. 4, figs. 16, 17. 



The shell is perforate, globose-conic, thin, olive-buff, some- 

 what glossy. Sculpture of widely, unevenly spaced low rib- 

 lets, the intervals somewhat roughened by shallow pitting, 

 without spiral striation, the first two whorls very minutely 

 granulose. The whorls are strongly convex. Aperture trun- 

 cate-rounded. Peristome thin, slightly expanded below, the 

 columellar margin rather broadly dilated over the rather 

 large perforation. 



Length 1.7, diam. 1.44, length aperture 0.7 mm. ; 4y 2 whorls. 



Length 1.7, diam. 1.46, length aperture 0.7 mm. ; 4y 2 whorls. 



Length 1.65, diam. 1.3 mm. ; 4 whorls. Chama. 



Length 1.6, diam. 1.3 mm. ; 4 whorls. Chama. 



Mexico: about 500 ft. above the town of Orizaba (Heilprin 

 Expedition, 1890). Type and paratypes 28270 A. N. S. P. 

 Chama, Guatemala (A. A. Hinkley). 



The high form, distinct riblets and greater number of 



