36 



GUDE : SPECIES OF PLECTOPYLIS. 



the umbilicus is deeper, and the horizontal median parietal fold does 

 not quite reach the apertural ridge. The shell is darker in colour 

 and more strongly ribbed. — Major diameter, 19 mm.; minor diameter, 

 15 mm.; altitude, 7 mm. 



Hab. — Moulmain, Burma. Type in my collection. 



Is darker in colour than the type, being of a fuscous chestnut. It 

 is more compressed and distinctly ribbed ; the shell is higher in pro- 

 portion to the diameter, and the umbilicus is deeper ; the last whorl 

 does not widen suddenly, and the right margin of the peristome is 

 depressed, the aperture being consequently somewhat ear-shaped ; the 

 lower side slopes from the peripherial region to the umbilical angula- 

 tion. The armature does not differ materially from that of the type, 

 except that the median horizontal parietal fold does not quite reach 

 the apertural ridge. Six specimens were received by me from Miss 

 Linter, five of these being more or less decorticated. — (Ibid., v, p. 1 1 5.) 



Plectopylis achatina var. infrafasciata, Gude. 



Differs from the type in being more rounded in contour, and in 

 the last whorl not widening at the aperture ; the umbilicus is more 

 shallow and the peristome more flattened and reflexed ; the right 

 margin is a little depressed ; the shell is blackish or purplish brown 

 above, with a white or bluish white band below, reaching from the 

 umbilical angulation to the lower suture ; the peristome is purplish 

 brown, the left margin being paler. — Major diameter, 22 mm.; minor 

 diameter, 18 mm.; altitude, 8 mm. 



Fig. 14. — Plectopylis achatina var. infrafasciata, Gude. 



Hab. — Limestone Rocks, Moulmain, Burma. Type in my col- 

 lection. 



Is still darker than the variety obesa, being of a blackish or purplish 

 brown. Like that variety it is rounded in contour, but it is larger 

 and more flattened ; while the umbilicus is a little more shallow and 



