491 Mr. II. B. Pieston on new Shells 



latter especially noticeable on the lower half of the body- 

 whorl ; sutures impressed ; ajjerture receding towards the 

 1 use, narrowly, inversely auriform ; columella expanded over 

 the very narrow umbilical perforation ; peristome simple. 



Alt. 2G-5, diam. maj. 9*5 mm. 



Aperture: alt. 10-25, diam. 4 mm. 



Bab. 'J'o the north of the Hio Pilcomayo, Chaco, Bolivia, 

 600 metres. 



Bulimulus {Drymceuti) Murenoi, sp. n. (Fig. 7.) 



Shell ovate conic, narrowly perforate, pale yellowish white ; 

 whorls G|, convex, marked with lines of growth and showing 

 traces of very tine spiral striae ; sutures impressed and 

 irregularly crenulate with lines of growth ; aperture acumi- 

 nate, oval ; peristome simple ; columella descending some- 

 what obliquely and reflexed over the umbilical region. 



Alt. 23*5, diam. mnj. 11 mm. 



Aperture : alt. 10*5, diam. maj. 5 mm. 



Hab. Argentina. 



Bulimulus [Drymceus] comi's, sp. n. (Fig. 8.) 



Shell narrowly fusiform, smooth, milk-white, painted on 

 the lower portion of the whorls with transverse bands of 

 purplisb and greyish black ; whorls 6, marked with very fine 

 lines of growth; sutures impressed; umbilicus narrow; 

 aperture inversely auriform ; peristome thin^ expanded 

 especially below ; columella twisted into a fold, and diffused 

 into a pale purple callus which reaches the lip above ; 

 interior of shell pale purple. 



Alt. 28, diam. maj. 12 mm. 



Aperture: alt. ll'S, diam. 5"0 mm. 



JIab. Bogota, United States of Colombia. 



Bulimulus {Drymceus^ solidus, sp. n. (Fig. 9.) 



Shell fusiform, rather solid, very narrowly perforate, 

 smooth, polished, cream-coloured, painted with two inter- 

 ru])ted spiral bands of greyish black and five wavy transverse 

 lines and streaks of greyish purple ; whorls 5^, slightly 

 convex ; sutures impressed ; aperture ovate, somewhat 

 oblique ; peristome white^ rather thick, slightly reflexed ; 

 columella descending obliquely and reflexed over the very 

 narrow umbilicus, white below, purple above and diffused 

 into a purple callus which joins the upper mai-gin of the lip ; 

 interior of shell purple. 



