1920. 



NATURAL SCIENCES OF PHILADELPHIA. 



329 



A COLOMBIAN PUPILLID SNAIL. 



BY HENRY A, PJLSBRY. 



Among other interesting mollusks collected by Messrs. Morgan 

 Hebard and J. A. G. Rehn during their recent visit to Colombia, 

 there were specimens of a peculiar snail of the family Pupillidse, 

 which may be described as follows. 



Gastrocopta colombiana n. sp. Figs. 1-4. 



The shell is thin, faintly brown tinted, subcylindric, but tapering 

 very slowly from the last whorl, composed of 53^2 strongly convex 

 whorls, the last whorl somewhat flattened dorsally, with a slight 

 impression over the inner part of the lower palatal fold. Faintly 

 striate. The aperture is squarish-oval; peristome thin, well ex- 

 panded and reflected, continuous across the parietal wall, but very 

 shortly adnate there. The angulo-parietal lamella reversed y- 



Figs. 1, 2. — Gaslrocopia colombiana, enlarged aperture and front view of type. 



Fig. 3. — Columella and parietal wall seen from below, the peristome above, show- 

 ing: c, columellar lamella; p, parietal, and a, angular lamellae. 



Fig. 4. — Inside of the palatal wall, the peristome on the right, s, suprapalatal 

 fold; u, upper palatal; I, lower palatal, and b. basal folds. 



shaped, the angular sinuous, emerging to the lip edge, parietal 

 arcuate, higher, emerging much less. Columellar lamella strong, 

 lunate, the inner half descending, outer horizontal. Within the 

 outer lip there is a small, high, suprapalatal fold and a larger, more 

 immersed upper palatal. Lower palatal fold is very long, somewhat 

 immersed, oblique and indistinctly binodose in front, its upper end 

 continued inward as a slender ridge, then enlarging into a high, 

 stout fold. The basal fold is transverse, weakly bilobed. 



