RECENTLV DESCRIBED SPECIES OF PLECTOPYLIS. 45 



I found two specimens in the Theobald coHection of the 

 British Museum, labelled Pledopylis brachyplccta, which, in spite 

 of some external resemblance to that species, presented sufficient 

 differences to lead one to suspect that they were distinct, and on 

 opening one of them I found that the difference in the armature 

 confirmed this suspicion. In basing a new species upon them, 

 I have much pleasure in dedicating it to Mr. Smith, whose 

 permission to open the shell enabled me to investigate the 

 matter. 



Pledopylis siuithiana differs from P. hrachyplecta in being 

 darker and larger. The ribs are coarser and the Vv-horls more 

 convex ; the last whorl is not angulated above, and it widens 

 more towards the aperture. The peristome is less thickened 

 and more reflexed, and the ridge of the parietal callus less 

 stout but more raised, while the umbilicus is wider and much 

 more shallow. The horizontal parietal fold deflects more at the 

 aperture and there is only one vertical plate (see fig. i d), which 

 is crescent-shaped, with the convex side towards the aperture ; 

 on its anterior side, in place of a second vertical plate as in 

 P. hrachyplecta, are found two elongated, oblique, converging 

 denticles, one abcve and one below. The palatal armiture is 

 similar to that of P. hrachyplecta. Fig. id, which shows the 

 parietal wall, is from one of the specimens in the British 

 Museum. Figs. la-ic are drawn from a specimen, labelled 

 Attaram, obligingly lent to me by Miss Linter, of Arragon Close, 

 Twickenham, who informs me that she received it from Mr. 

 Theobald. This was also labelled P. hrachyplecta, but I have no 

 hesitation in referring it to the new species. It measures — 

 major diameter, 26 millimetres ; minor diameter, 21 millimetres ; 

 axis, 9 millimetres. (Science Gossip, New Series, Vol. III., 

 March, 1897, P- 274. By kind permission of the Editor). 



Plectopylis plectostoma var. tricarinata, Gude. 



Differs from the type in being larger, in having the periphery 

 acutely keeled, and in having three raised ridges between the 

 periphery and the suture, revolving as far as the fourth whorl. — 

 Major diameter, 10 millimetres ; minor diameter, g millimetres ; 

 axis, 6 millimetres. — Habitat, Bengal. — Type in the McAndrew 

 collection of the University Museum of Zoology, Cambrid^'c, 



A tablet in the McAndrew collection contains five specimens, 

 labelled "■Plectopylis plectostoma Bengal, Benson coll.," two of 



