346 ME. E. A.. SMITH OlS" KEW 



10. Lagocheilus BOUNEEisrsis. (PL XXV. figs. 10, 10 a.) 

 Testa parva, depressa, late umbilicata, pallida, strigis rufis obliquis 



radiantibus ornata, epidermide tenui pilosa induta ; anfractus 5, convex! , 

 striis spiralibus tenuibus incrementique lineis obliquis minute cancellati, 

 ultimus subtus nitidior quam supra, antice subdescendens ; apertura 

 rotundata ; peristoma vix incrassatum, margine externo anguste expanso, 

 columellari angustiore. 



Diam. maj. 65 millim., min. 5| ; alt. 4|. Apertura 2^ alta et longa. 



Sab. Barit Mountain, 'N.W. Borneo, The variety (lig. 10 a) 

 is from Busau. 



This is a pretty little striped species clothed with a finely 

 pilose epidermis. The slight emargination or notch on the peri- 

 stome is very minute. Two figures are given to show the varia- 

 tion in form. 



11. OpISTHOSTOMA MIEABrLE. (PI. XXV. figs. 11, 11 a.) 

 Testa dextrorsa, conica, anguste et profunda umbilicata, rufescens vel 



pallida ; anfractus 7, convexi, primi duo laeves, caeteri lamellis tenuissimis 

 pellucidis, remotis, spinis elongatis fere rectis sursum directis, instructis, 

 ornati; spinarum series in anfr. ultimo valde curvata ; lamella ultima pone 

 aperturam maxima, scutiformis ; apertura retrorsa, circularis ; peristoma 

 tenue, leviter expansum. 



Alt. 4 millim., diam. maj. 5, min. 2|. Apertura cum perist. 1^ lata. 



Sab. Gromanton Hill, N. Borneo. 



The long upcurved spines which form a single series around 

 the whorls are almost straight upon the upper volutions, but 

 upon the last, which is detached for some distance from the 

 penultimate and is twisted backward and upward, they are 

 much curved towards the umbilicus. They are pellucid and 

 semitubular. The most striking feature of this wonderful species 

 is the great development o£ the last lamella behind the aperture, 

 where it forms a sort of ear-shaped shield. 



12. Opisthostoma Everetti. (PI. XXV. figs. 12, 12 a.) 

 Testa dextrorsa, conica, rimata, rufescens vel alba; anfractus 5-5|, 



convexi, primi duo Iseves, cseteri lamellis obliquis tenuissimis in medio 

 spiniformibus instructi, ultimus antice longe solutus, versus aperturam 

 retrorsum et sursum contortus, seriebus duobus spinarum ornatus; spinse 

 semitubuliformes, curvatae ; series inferior longior, cristam basalem for- 

 mans ; apertura circularis rufescens vel alba; peristoma tenue, undique 

 late expansum et concentrice striatum. 



Alt. 3 millim., diam. maj. 3f, min. 2. Apertura cum perist. 1^ lata. 



Sab. Jambusan, N.W. Borneo. 



In this species the oblique lamellae are rather far apart and 



