Land- shells of tlw Xude/iti I.sl<tii<ls. 459 



The specimens from tlic above localities of ;ulult age agree 

 precisely with the Malaccan form of this species. In very 

 oKl cxamj)lcs, however, which have the outer surtace more or 

 less worn the aperture becomes of a bri<rht oranire-rcd and 

 the lip IS also tinted. 



17. Leptojwma natunense. (PI. XVI. Hg, 8.) 



Testa turbinata, anguste umlnlicata, tenuis, pcUucida, cornea, pone 

 lubrum pallida rufum vtd album, striga nigra obli(pia oriiata ; 

 spira eoiiica ; anfractus o, convexiusculi, liris vel cariuis tenuibus 

 (in anfract. penult. 4, ultimo 7) instruct!, ultimus carina quinta 

 ad periphoriam subangulatus, antice vix descendens ; apertura 

 magna, longit. totius h paulo superans ; peristoma duplex, margine 

 interno leviter incrassato, cxterno tenui, plane dilatato ad 

 umbilicum retlcxo, oxtremitatibus callo tenuissimo junctis. 



Diara. raaj. K}*") milliin., min. 10, alt. V&o ; apertura intus ()•-") 

 longa ct lata. 



Hah. Bunguran and Sirhassen. 



The specimens from Bunguran have the peristome of a 

 pale red tint, whilst in those from Sirhassen it is white. 



This species bears a very close resemblance to L. Mathildtc, 

 Dohrn, fro'm Mindanao, and is merely a slight moditication of 

 that form. It differs in having a slightly narrower umbilicus, 

 an additional spiral lira on the j)enultimate whorl, no fine 

 spiral striae or merely the faintest indication of them, and the 

 peristome is more distinctly double, the outer margin being 

 more flatly ex])andcd. 



IS. Lagochilus hunguranensis. (PL XVI. fig. 9.) 



Testa late umbilicata, depresse turbinata, saturate fusca, liris spiral- 

 ibus teninbus unditpie cincta, lincis incrementi obliqius sub- 

 cancellata, epidermide rugosa, 8etosa,amicta; anfractus G, cclcriter 

 crescentcs, perconvexi, sutura profunda sejuneti, apicalcs duo 

 laeves, ultimus antice leviter descendens ; apertura circularis, 

 intus sordide ca^rulea, mediocriter magna ; peristoma duplex, 

 margine externo breviter cxi)anso, acute, interno paulo incrassato, 

 cferulescente, superne leviter inciso. 



Diam. maj. 17 millim., min. 13-5, alt. 12 ; apertura G longa et lata. 



Ilah. Bunguran. 



This species is \\-c\\ characterized by its deep brown colour, 

 the fine spiral lirge, the strong oblique lines of growth, and 

 the rough epidermis produced into very short hairs upon the 

 ridges. The thin horny yellowish epidermis consists of nine 

 or ten narrow volutions. 



