SPECIES OF LAND-SHELLS FROM BORNEO. 349 



19. DiPLOMMATIlirA SYMMETRICA. (PI. XXV. fig. 19.) 



Testa dextrorsa, imperforata, fusiformi-ovata, pallide lutea, versus api- 

 cem rufescens; anfractus 7i, perconvexi, regulariter crescentes, sutura 

 profunda sejuncti, costulis tenuissimis lamelliformibus breviter obliquis 

 numerosis instructi, inter costas leeves, ultimus penultimo subangustior, 

 contractus ; apertura parva, subcircularis, cum perist. longit. totius f 

 adaequans ; peristoma duplex, luteum, raargine externo valde incrassato, 

 ad columellam angulatim producto, supra parietem tenui. 



Longit. 3| millim., diam 1^. Apertura cum perist. 1 longa. 



Sai. Gomanton Hill, N". Borneo. 



D. Aldrichi of Grodwin- Austen is allied to this species, but 

 is more tapering above and bas a diiTerent peristome and a 

 stronger columellar tootb. Tbe lamellae are about eighteen in 

 number ou tbe penultimate volution. 



20. DiPLOMMATINA ESCENTfilCA. (PI. XXV. fig. 20.) 



Testa dextrorsa, imperforata, irregularis, distorta, sordide albida, versus 

 apicem pallida rufescens ; anfractus 7, convexi, primi quinque regulares, 

 penultimus excentricus, sinistrorsum constrictus, omnes lamellis tenuissimis 

 subremotis, leviter obliquis instructi ; apertura mediocriter magna, irregu- 

 lariter circular! s, ad columellam subcanaliculata ; peristoma duplex, margine 

 Interno crasso continuo, externo ten ui lamelliformi superne subinterrupto, 

 utrinque producto ; columella obliqua, in medio dente conspicuo munita. 



Longit. 3 millim., diam 1^. Apertura cum perist. L 



Hah. Molu orMulu Mountain, N. Borneo. 



This species is remarkable for its distorted aspect, occasioned 

 by the remarkable constriction and bulging of the penultimate 

 whorl. The peristome is conspicuously produced both on the 

 right side of the aperture and at tbe base of the columella. 



21. DiPLOMMATINA EVERETTI. (PL XXV. fig. 21.) 



Testa dextrorsa, imperforata, subpellucida, sordide albida, ad apicem 

 rufescens ; anfractus 7, convexi, lamellis tenuissimis subdistantibus flexuo- 

 sis ornati, primi quinque regulares, quintus latus, angulatim rotundatus, 

 penultimus maxime constrictus, distortus, Isevis ; apertura irregulariter 

 rotundata ; peristoma duplex, pallide luteum vel albidum, paulo expan- 

 sum, ad basim columellse productum ; columella rectiuscula, in medio dente 

 parvo acuto munita. 



Longit. 3^ millim., diam fere 2. Apertura cum perist. \\ longa. 



Sab. Barit Mountain, N.W. Borneo. 



This species is a trifle larger than D. excentrica. When 

 viewed with tbe aperture to tbe eye, the penultimate whorl is a 



