40 PUPISOMA. 



Length 1.95, diam. 1.85 mm. ; nearly 4 whorls. 



Texas: Brownsville, type loc. (fig. 7). Hidalgo (fig. 6). 

 Mexico : Valles Falls, Ganina River and Choy cave, San Luis 

 Potosi (A. A. Hinkley) ; Izamal, Yucatan (Heilprin Exped.). 

 Demerara (fig. 8), (R. Swift). 



The single example from Demerara has the ribs very 

 strongly developed (pi. 4, fig. 8). Those from San Luis 

 Potosi have very distinct spiral lines, 4 whorls. 



A few similarly sculptured specimens were found in lots 

 from Miami and Gainesville, Florida, and, as mentioned 

 above, one was found at Montego Bay, Jamaica ; in both cases 

 among typical dioscoricola, and having the same number of 

 whorls. The status of the form is therefore somewhat doubt- 

 ful, but it would be a fault to omit notice of a form so con- 

 spicuously differentiated. 



17. PUPISOMA MICHOACANENSE u. sp. PL 4, fig. 12. 



The shell is narrowly perforate, globosely conic, higher 

 than wide, grayish buff (corneous). Surface marked with 

 some irregularly-spaced growth-wrinkles but without spiral 

 lines. The aperture is rounded, not much excised by the 

 penult whorl, peristome simple, the columellar margin tri- 

 angularly dilated but less broadly than in P. dioscoricola. 

 Length 1.6, diam. 1.4 mm. ; 3i/ 2 whorls. 



Mexico: Morelia, Michoacan, S. N. Rhoads, 1899. Type 

 77119 A. N. S. P. 



Distinguished by the high contour and absence of spiral 

 sculpture. 



18. PUPISOMA MINUS n. sp. PI. 4, figs. 9, 11. 



The shell is very narrowly umbilicate, globose-conic, cinna- 

 mon-colored, but slightly glossy. Sculpture of very minute, 

 shallow, confluent pits, or it might be described as densely 

 vermiculate-granose ; a few strife are indistinctly developed, 

 but no trace of spiral lines. The whorls are strongly convex. 

 Aperture rounded-oval, excised moderately by the penult 

 whorl. Peristome simple and thin, the columellar margin 

 broa.dly dilated, half covering the umbilicus. 



