348 ME. E. A, SMITH ON NEW 



16. OpISTHOSTOMA BUSAUENSE. (PI. XXV. figS. 16, 16 «.) 



Testa miuuta, anguste perforata, plus minus rufescens ; anfractus 5, 

 perconvexi, sutura profunda sejuncti, apicales 1-2 Iseves, sequentes oblique 

 et distanter tenuiter lamellati, ultimus antice confertius lamellatus, vix 

 solutus, retrorsum et sursum contortus, inferne subcristatus ; apertura 

 mediocriter magna ; peristoma album, duplex, margine externo interno 

 latius expanse. 



Alt. 1| millim., diam. maj. 1|, min. 1. Apertura cum perist. § lata. 



Hob. Busau, N.W. Borneo. 



This is a very minute species, and considerably smaller than 

 any of those previously described. The lamellso are quite far 

 apart, excepting upon the contorted portion of the body-whorl, 

 where they become crowded. 



17. DiPLOMMATIKA SFLPHIJEEA. (PI. XXV. fig. 17.) 



Testa ovata, superne acuminata, imperforata, sinistrorsa, flavescens; 

 anfractus 8, convexi, lineis increraenti tenuibus obliquis sculpti, penultimus 

 gibbosus, ultimo latior, ultimus contractus, primum valde obliquus, antice 

 conspicue ascendens ; apertura irregulariter rotundata, sulphurea, longit. 

 totius 5 adsequans ; peristoma tenue, leviter expansum, flavum, marginibus 

 callo tenui junctis, columellari rectiusculo, intus denticulo mediano munito, 

 supra regionem umbilici duplice, partim appresso, partim libero promi- 

 nente. 



Longit. 7 millim., diam. 3. Apertura 2| longa. 



Hob. Molu or Mulu Mountain. 



The sulphur colour is rather more vivid within the aperture 

 than upon the exterior of the shell. The lip is simple, merely 

 slightly expanded and reflexed. 



18. DiPLOMMATINA MOLTJENSIS. (PI. XXV. fig. 18.) 



Testa acuminato-ovata, sinistrorsa, imperforata, cerea, subnitida, versus 

 apicem rubra ; anfractus 7, convexi, regulariter crescentes, costulis tenuibus 

 obliquis leviterque flexuosis subdistantibus instructi, ultimus contractus, 

 antice ascendens, penult. leviter gibbosus, latitudine ultimum sequans ; 

 apertura rotundata, ad columellam recta, inferne leviter canaliculata, intus 

 flava ; peristoma duplex, margine interno continuo, porrecto, externo 

 lamelliformi, expanso ; columella recta, dente parvo instructa. 



Longit. 5 millim., diam 2|. Apertura 2 longa. 



Sah. Molu or Mulu Mountain, N. Borneo. 



This species is of a glossy waxy yellow colour, with the apex 

 red. The riblets are oblique, a little wavy, and about eighteen 

 in number on the penultimate whorl. 



