226 SYSTENOSTOMA AND BOTHRIOPUPA. 



quite convex whorls, slowly increasing, without any trace of 

 sculpture; the last whorl shortly descending quite suddenly 

 at the end and contracted behind the peristome. Aperture 

 oblique and irregularly rounded, turned in towards the axis. 

 Peristome continuous, simple, detached, very slightly thick- 

 ened and reflected. Color dirty white, all the specimens being 

 dead and discolored. Alt. 2, width 1.5 mm. (B. & D.). 



Tonkin: Phu-Quoc-Oai, in shell debris (M. Demange). 



Helix (Systenostoma) pauperrima BAVAY & DAUTZENBERG, 

 Journ. de Conchyl., Ivi, 1909, p. 243 ; Ivii, p. 195, pi. 8, f . 4-6. 



3. SYSTENOSTOMA DEFIXA Bav. et Dautz. PL 38, figs. 15, 16. 



The shell is very small, broadly and perviously umbilicate, 

 depressed conic, the base strongly dilated. Spire conoid, mod- 

 erate. Five convex whorls, joined by an impressed suture, 

 smooth and buff. Last whorl is very large, slightly subangular 

 at the periphery, and descending towards the end. The aper- 

 ture is very oblique, slightly detached, subcircular, flattened 

 above; peristome simple, continuous, slightly dilated. Color 

 very pale yellow, darker towards the apex. Alt. 1, greatest 

 diam. 1.6 mm; diam. aperture % mm. (B. & D.). 



Indo-China: Table Island, Bay of Along (M. Demange). 



Systenostoma defixa BAVAY & DAUTZENBERG, Journ. de Con- 

 chyl., 1912, p. 22, pi. 1, f. 18, 19. 



"This little species, like the two others of the same genus 

 described by us, has the appearance of a young shell. A 

 fourth species represented by a single example, really not 

 adult, will not be described at this time. ' ' 



Genus BOTHRIOPUPA Pilsbry. 



Bothriopupa PILS., Nautilus, xi, 1898, p. 119, for Vertigo 

 variolosa. 



The shell is minute (known species l%-2 mm. long), per- 

 forate, ovate-conic, of about 4% convex whorls; surface 

 minutely and densely pitted, or granulose by confluence of the 

 pits, hardly or not striate. Aperture broadly truncate above, 

 the lip-insertions remote; outer lip slightly, the columellar 

 broadly expanded. Parietal lamella median, curved ; a short, 



