14 



GUDE : SPECIES OF PLECTOPYLIS. 



Habitat, Burma. — Type in my collection. 



Five shells, labelled "Burma," without further indication of locality, 

 received by the writer, from Mr. Hugh Fulton, under the name of 

 Fledopylis leiop/iis, proved upon examination to be distinct, and to 

 belong, in fact, to a different group oi Pledopylis. They represent a 



Fig. 9. — Plectopylis Iciuocliila, Gudk. 



species — for which I propose the name Plectopylis Icucochila — allied 

 to P. ponsonl/yi, but differing from it in the more raised spire and in 

 having a deeper and more perspective umbilicus. In the armature 

 this new species differs from the other members of the group of 

 P. po7tso7ihyi in having the upper parietal fold uninterrupted. Figs. 

 9^-^ show the shell in three different aspects, natural size, while figs. 

 9 ^ and ^ are enlarged; the former shows the parietal wall with its 

 plates and folds, and the latter the inside of the outer wall with the 

 folds and denticles. 



Plectopylis perrierae, Gude. 



Shell sinistral, discoid, widely and deeply umbilicated, pale 

 corneous, very finely and regularly striated, and decussated by spiral 

 lines. Suture slightly impressed, spire flattened, apex a little raised, 

 whorls six to seven, increasing slowly and regularly, flattened above, 

 rounded below, the last angulated above the periphery and round the 

 umbilicus, and decending shortly and abruptly in front. Aperture 

 heart-shaped ; peristome white, scarcely thickened, a little reflected ; 

 the margins united by an elevated sinuous ridge on the [)arietal callus, 

 notched at the lower junction. Umbilicus wide and deep. Parietal 

 wall with a thin vertical plate, strongly deflected posteriorly below, 

 and giving off a short horizontal ridge at the upper extremity on each 

 side ; a long horizontal flexuous fold rises close to the upper extremity 

 of this plate on the anterior side, decending suddenly at first, then 

 ascending gradually, and afterwards gradually descending, following 

 the deflection of the last whorl, becoming united to the ridge at the 



