GUDE : SPECIES OF PLECTOPVLIS. 9 



Plectopylis stenochlia, var. basilia, Gude. 



Differs from the type in the more conical spire, the more 

 flattened whorls and the acutel)' keeled periphery. — Diam., 6-7 

 millimetres. 



Habitat, Badung, Province Hoo-Pe, China. 



Fig. 6. — Plectopylis stcnochila, var. basilia, GuDE. 



Plectopylis stetioikila, var. basilia, from Badung, Province of 

 Hoo-Pe, was sent to me by Professor Oscar Boettger, of Frankfort. 

 It has a more conical spire and the whorls are more flattened than in 

 the type (see "Science Gossip," N.S., vol, iii., p. 204, f 29); the 

 periphery is acutely keeled, while in the type it is rounded. The 

 parietal armature differs in having only four simple denticles anteriorly 

 to the vertical plate, the second denticle being very minute (see fig. 

 6c) ; the palatal armature is identical with that of the type. — Ibid, 

 p. 36. 



Plectopylis mag-na, Gude. 



Shell sinistral, solid, discoid, widely and deeply umbilicated, 

 horny brown, finely and regularly ribbed. Suture slightly impressed, 

 spire depressed, apex scarcely raised. Whorls 7I, a little rounded 

 above, tumid below, increasing very slowly, the last widening a 

 little towards the aperture, descending somewhat slowly in front, 

 and a little constricted behind the peristome. Aperture elliptical, 

 peristome white, thickened and reflexed, margins scarcely converging. 

 Parietal callus with a raised flexuous ridge, separated from both 

 margins of the peristome by a little notch. Umbilicus wide and 

 deep. Parietal wall with a short, entering, flexuous, horizontal 

 fold, which terminates at a distance of two millimetres from the 

 parietal ridge at the aperture, and having at one-third of the cir- 

 cumference from the aperture two strong transverse plates ; the 



