142 HELIOIDiE. 



In colour the shell is chestnut-brown above, while the umbilical 

 region is white, in which it resembles the variety infrafasciata. 

 The present variety is based on a shell in my collection, but 

 the Museum of Mason's College, Birmingham, possesses three 

 specimens identical with it. 



Tar. infrafasciata, Gude. 



Helix achatina, PfeifFer, Conch.-Cab., Heliceen, i, 1848, p. 382, 

 pi. 66, fio-s. 28-30 ; Hanley & Theobald, Conch. Ind. 1870, pi. 57, 

 figs. 8, 9. 



Plectopylis achatina, var. infrafasciata, Gude, Science Gossip, n. s. 

 V, 1898, p. 133, fig. 84. 



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 lo\^er suture ; the peristome 

 is purplish brown, the left margin being paler. 



Major diam. 22, minor 18 mm. ; alt. 8 mm. 



Hah. Burma : Moulmain ; Mergui {Philippi). 



Plectopylis hensoni, var. infrafasciata, is still darker than the 



c 



Fig. 73. — Plectopylis bensoni, Tar. infrafasciata. 



variety ohesa, 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 the peristome 

 more flattened and reflexed than in the type. The peristome is 

 livid purplish in colour, the left margin being paler and the right 

 margin a little inflected. A whitish or bluish-white band below 

 reaches from the umbilical angulation to the lower suture. The 

 armature is similar to that of the type, but the horizontal parietal 

 fold near the lower suture is visible from the aperture and ter- 

 minates close to the ridge. The specimen figured was received 

 by me from the late Eobert Cairns. Four specimens in the 

 collection of the late E. L. Layard and one specimen in the 

 McAndrew collection (the latter labelled " Plectopylis refiiga ") 

 all belong to this form. The late Robert Cairns also sent me for 



