68 Zoological Society. 



sti'iisque numerosissimis transversis notatd ; peristomate sim- 

 plici, acufo, margine colnmellari vix reflexo. 

 Long, lyo ; ^^t. 1 ; alt. -^-^ unc. 



A bright shell, resembling a thin film of glue, with a keel of a 

 darker shade ; slightly indented above and below the keel, the in- 

 dentation elegantly crossed with slight striae, the effect of which, as 

 well as the darker line, is partially visible throughout the sutures. 



7. Helix conicoides, nobis. H. testd imperforatd, trochi- 

 fonni, acute carinatd, tenui, pellucidd, luteo-corned ; spiraliter 

 leviter striata, striis ad suturam majoribus, confertioribus ; 

 apice mamillari ; anfractihus 7, superiorihus siihconvexis, duo- 

 bus ultimis planidatis, ultimo subtus convexo, nitido, ad cari- 

 natn et in medio depresso ; aperturd trapeziformi, subtus arcu- 

 atd ; peristomate simplici, acuto, subtus flexuoso, maryinibus 

 callo tenui junctis. 



I^ong. ^L; lat. ^ ; alt. ^ unc. 



8. BuLiMus ciTRiNus, Bruguierc ; Reeve, Conch. Icon. Bui. 

 pi. 31. fig. 187 «. 



9. BuLTMUs CHLORis, Rcevc, Conch. Icon. Bui. pi. 37. fig. 223. 



10. Cyclostoma Borneensis, nobis. C. testd siiborbiculari, 

 depresso-conoided, acuminata, albidd, fusco-variegatd, tnaculis 

 ad suturam, cingtdo(pie infra medium fusco ornatd ; striis ob- 

 liquis minutis, aliisque circularibus minutissimis impressd ; an- 



fractibus quinqiie planiusculis, carinatis; idtimo magno, margine 

 acute carinato, circa umbilicum obtuse angulato ; aperturd sub- 

 circulari; peritremate albo, reflexo; supra productiore, subtus 

 reflexo, ad columellam subsinuato ; umbilico magno, profundo ; 

 operculo corneo, tenui. 



Long. 1^^; lat. 1^; alt. -^-^ unc. 



Varietas minor, magnitudine solum diversa. 



Shell bearing some characters in common v/ith both C. aquilum. 

 Sow., and C. acutimarginatum. Sow. ; but having a more depressed 

 spire, and flatter whorls than either of those species. 



11. Cyclostoma, apparently C.parvum, Sow. Thes. Conch. Cycl. 

 fig. 254, 255. 



12. Cyclostoma UNDATUM, nobis. C testd globoso-pyramidali, 

 tenui, pellucidd, albd, lineis hyalinis undatis decurrentibus or- 

 natd, tenuiter striatd ; unfractibus G, parum rotundatis, pri- 

 mis conicis regulariter crescentibus ; ultimo magno, obtuse cari- 

 nato; aperturd circulari, superne angidatd ; peritremate lato, 

 expanso, vix nisi ad columellam reflexo; suturis mediocribus ; 

 umbilico parvo. 



Long. -^\ ; lat. ^^ ; a^t. ^ unc. 



This species belongs to the division of the genus of which C. Iceve, 

 Gray, may be considered the type. 



13. Cyclostoma tenuilabiatum, nobis. C. testd discoided, 

 spird depressd, ])land, colore pallido, superne castaneo-macu- 

 latd et undulatd ; epidermide luteo-castaned, indutd ; anfrac- 

 tibus 5 rotundatis, 4 j)>'inns Itevibus, ultimo lineis impressis 



