22 PUPISOMA. 



bles that of the typical Pupisomas, some Nesopupse and Both- 

 riopupu. 



III. Ptychopatida Pils. Shell globose-conic, of 3 l / 2 to 4 

 whorls, striate or irregularly ribbed, usually with spiral lines; 

 columella concave, simple, the coluniellar margin dilated. 

 P. dioscoricola, P. orcula and their allies, East and West. 



Old World Species. 



The sculpture has been imperfectly described in some of 

 these species; the following key may, therefore, require re- 

 vision. 



1. Shell decidedly higher than wide, of 4i/ 2 to 5 whorls; 

 surface microscopically granose-pitted ; columella ob- 

 liquely truncate below II 



Shell but little higher than wide, or not so, of 3 to 5 

 whorls ; surface striate ; columella continuously curv- 

 ing into basal lip Ill 



11. Pale gray; 2 to 2.15 mm. long; Burma. 



P. lignicolU', no. 1. 

 Brown ; 2.25 to 2.63 mm. long ; Western Ghats. 



P. evezardi, no. 2. 



III. Peristome thickened and reflected; a varix on the last 



whorl ; perforate ; alt. 2.2, diam. 2.1 mm. ; 5 whorls. 



Andaman Is P. constrictum, no. 6. 



Peristome simple ; no varix IV 



I V. Surface without spiral lines V 



Surface having microscopic spiral lines ; very narrowly 



perforate VII 



V. Imperforate ; species of Ceylon VI 



Umbilicus about one-seventh the width of the shell ; 

 alt, 1.2, diam. 1.16 mm. to 1.55x1.45 mm.; 3VL> 



whorls P. japonicum, no. 3. 



VI. Surface striatulate ; alt, 1.5, diam. 1 mm., 4 whorls. 



P. miccyla, no. 4. 



Surface costulate; 3 whorls P. lo-ncfstaffi, no. 5. 



VI 1. Alt. 1, diam. 1.3 mm., 4 whorls; striatulate, Borneo. 



P. pnlviscnlum, no. 9. 



