122 LAND- AND FRESHWATER MOLLUSKS 



the only specimen. It is a dead shell, which when living 

 seems to have been of a brown colour, with a yellow 

 peripherial band and a light yellowish-brown base. The 

 sides of the spire are more convex than usually, but not 

 more than in fig. 162 of P. and F. Sarasin (1. c). On the 

 last whorl, which is partly covered by a yellow epidermis, 

 I see numerous, irregular, oblique striae, not mentioned in 

 any of the descriptions at my disposal, but I find a similar, 

 though less developed sculpture on a few of the specimens 

 of X. trochus from Patunuang, South Celebes, received from 

 H. Fruhstorfer. Perhaps, if more specimens in good condition 

 could be compared, this form may receive a new varietal 

 name ; the colour is very peculiar and I find nothing like 

 it mentioned in litterature. 



3. Hemiplecta xullaensis^ n. sp. 



Shell orbicular-convex, narrowly perforate, thin, slightly 

 keeled, the keel almost disappearing anteriorly, horncoloured 

 with a supraperipherical, rufous band accompanied by a yellow 

 one, which can become obsolete towards the aperture; spire 

 moderately convex, apex blunt, whorls about 4, slightly 

 convex, with a deep suture. Sculpture consisting of fine 

 growth-striae, with eventually stronger ones, giving to the 

 shell a nearly ribbed appearance in some parts; on the 

 ultimate and penultimate whorls, they are crossed by im- 

 pressed, rugose striae ; base convex, lighter coloured, with 

 fainter sculpture. Aperture diagonal, lunate, margins thin, 

 straight, connected by a thin layer, columellar margin 

 reflected over the umbilical perforation. 



The measurements of the largest, probably adult, specimen 

 which is more depressed, and of another one are: 



Diam. maj. 28, min. 22, alt. l^^j-^, apert. alt. obi. 14, 



[lat. 16 Mill. 

 » » 26^/^, » 22, » 18, » alt. obi. 15, 



[lat. 14'/, Mill. 



This species, which, as just stated, varies slightly in 



Notes from the Leyclen IMuseuiii, "Vol. XXVllI. 



