GUDE : SPECIES OF PLECTOPYLIS. 37 



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

 peristome is livid purpUsh 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 terminates close 

 to the ridge. The specimen figured was received by me from Mr. 

 Robert Cairns. Four specimens in the collection of Mr. E. L. Layard 

 and one specimen in the McAndrew collection (the latter labelled 

 '■'■ PJeciopylis refuga'") -sW belong to this form. The shell figured in 

 Hanley and Theobald's " Conchologia Indicaj" t. 57, f. 8 and 9, and 

 Martini und Chemnitz '■'■ Concliylien Cabinet'''' (2) i. t. 66, f. 28-30 (from 

 Mergui, Burma), I also refer to this variety. A specimen measuring 

 21 mm. in diameter is in the collection of Mr. Cairns, who also 

 possesses four immature shells in various stages of growth, all showing 

 sets of barriers similar to that of the immature P. achatma shown in 

 fig. 81 a. " Sci. Gos." V, p. 114. — (Ibid., p. 138.) 



Plectopylis achatina vap. venusta, Gude. 



Differs from the type and the other vatieties in being smaller. It 

 resembles the variety obesa in the deeper umbilicus, in the sloping 

 underside, in the comparative height of the shell, and in the median 

 parietal fold not reaching the apertural ridge, but the last whorl widens 

 more, as in the type. In colour it is pale yellowish-white, flammulated 

 with chestnut above aud at the side. The peristome is livid brown, 

 the left margin paler, the right margin a little depressed. — Major 

 diameter, 17 mm.; minor diameter, 14 mm.; altitude, 7 mm. 



b c 



Fig. 15. — Plectopylis achatina var. venusta, Gude. 



Hab. — Burma. Type in my collection. 



Is smaller than any form of F. achatina I have seen. It is pale 

 yellowish-white in colour, flammulated with chestnut above and at the 

 sides. It resembles the variety obesa in the deeper umbilicus, the 



