1910.] 



NATURAL SCIENCES OF PHILADELPHIA. 



509 



Guppya browni n. sp. Fig. 6. 



The shell is perforate, trochiform, distinctly angular at the pe- 

 riphery, thin, yellowish-corneous, glossy, 

 lightly marked with growth-lines. The 

 outlines of the spire are nearly straight. 

 Whorls 6^, moderately convex, the last 

 convex beneath, impressed around the 

 perforation, which is half covered by the 

 expanded columellar lip. Aperture some- 

 what lunate; peristome simple. 



Alt. 5.3, diam. 6.5 mm. 



Between Tabernillo and San Pablo, on 

 the new line of the Panama Railway. Type No. 101,319, A. N. S. P. 



This species is related to G. selenkai Pfr. but differs by being much 

 larger, less glossy, with the base less convex and the peripheral angle 

 far weaker. It is larger than any of the trochiform species known 

 to me. 



Fig. 6.— (?. browni. 



Explanation of Plate XXXVII. 



Figs. 1—4. — Pleurodonte otis orthorhinus n. subsp. 



Figs. 5-7. — Pleurodonte otis (Solander). Typical form. 



Figs. 8, 9. — Ailris sinuata panamensis n. subsp. 



