Lnnd-S/ieUs of (he Xatnna I.slan<Lf. 455 



Only two small examples, 2i mitlim. in diameter, were 

 collected by ^Ir. Everett, and both arc dextral. 



5. Trochonanitia affinis. {VX. XVI. tig:^. 2, 2 a.) 



Testa impcrforata, couica, acute carinata, tenuis, fusco-coruea, sub- 

 jjellucida. supra vix nitida, infra polita ; spira levitor concava, 

 conica, ad apicem rotundata ; anfractus 7, lento crescentcs priini 

 tros vel quatuor hevijiati, couvexiusculi, coeteri minus convexi, 

 oblique areuatini striati, lirisque spiraUbus paucis tenuibus supra 

 suturara fuscescentem oriiati, ultiinus inferno con%-exiusculus, iufra 

 carinam excavatus, coneentrice obsolete substriatus, baud descen- 

 dens ; apertura obliqua, anirulatim lunata ; peristoma teuuissi- 

 mum, margine columellari ad insertionem incrassato, albo. 



Diara. maj. IG millim., min. 15, alt. 9 ; apertura 8 lata, 2-5 alta. 



Hah. Bunguran and Sirhassen. 



This species is closely allied to T. conicoides from Borneo. 

 It diflfers, however, in the whorls increasing more slowly, so 

 that the last is but very little broader than the penultimate, 

 whereas in T. conicoides there is considerable difference. 

 The body-whorl in the present species is more convex beneath, 

 the aperture is of a slightly different form, and the few spiral 

 lirae are coarser than in the Bornean shell. 



6. Trochonanina hunguranensis. (PI. XVI. fig. 3.) 



Testa dopresse conica, acute carinata, imperforata, supra sordide 

 fusco-cornea, inferne pallidior, nitida : spira breviter convexe 

 conoidea ; anfractus 6, leviter convexi, supra suturam paulo 

 concavi, lente crescentes, lirulis spiralibus pluribus, linois incre- 

 ment! obliquis decussatis, sculpti, ultimus utrinque carinam 

 acutam iraprcssus, infra cotivexiusculus, baud spiraliter lirulatus, 

 antice baud descendens ; apertura angusta, obliqua ; peristoma 

 tenue, acutum, margine iiifero in medio excurvato et versus 

 carinam late sinuato, columellari ad insertionem incrassato et 

 rctlexo. 



Diam. maj. 16 millim., min. 14'5, alt. 8. 



Ilah. Bunguran. 



7. Trochomorpha natanensis. (Pi. XVI. figs. 4-4/).) 



Testa aperte umbilicata, orbicularis, acute carinata, tenuis, trans- 

 lucida, cornea, fuscescens ; spira brevis, conoidea, ad apicem 

 obtusa ; anfractus 6, conve.xiusculi, supra suturam concave de- 

 pressi, lente acerescentes, superne et infra lineis incrcmenti 

 tenuissimis striisque spiralibus tenuibus plus minus obsoletis 

 Bculpti, ultimus supra et infra carinam acutam aequo convexius- 

 culus, baud descendens : apertura parva ; peristoma tenue, 



.31* 



