73 



24. Neritina dubia, Chemn. Thes. Conch, fig. 81-88. 



25. Melania ciRCUMSTRiATA, Dobis. M. testa, elongatd, tur- 

 ritd, solidd, fusco-viridi ; anfractibus convexivscvlis, infra su- 

 turam paululum constrictis ; superioribus striis 6 transversis 

 elevatis, plicisque 8 majoribus longitudinalibus ornatis ; ultimo 

 striis 13; aperturd ovali-oblongd, basi dilatatd, superius acute 

 angulatd, et fere rimatd, intus albidd ; peritremate sinuato, 

 columelld callosd. 



Long. 2^ ; lat. ^ unc. 



26. Melania subsuturalis, nobis. M. testa turritd, fusco- 

 viridi, lineis castaneis longitudinalibus obliquis variegatd ; an- 

 fractibus fere planis, quorum superiores striis elevatis perpau- 

 cis validis, inferiores pluribus minoribus incequalibus ornati ; 

 ultimo ad basim crebristriato ; suturd distinctd, excavatd ; 

 aperturd ovali, superne angulatd, intus albido-ccerulescente ; 

 peritremate acuto, sinuato, extus effuso. 



Long. X-f-^ ; lat. ^ unc. 



27. Paludina Hamiltoni, nobis. P. testd ovato-conicd, tenui, 

 perforatd, viridi, concolore; striis transversis undulatis, aliis- 

 que longitudinalibus tenuissime decussatd ; anfractibus 5 rotun- 

 datis, superioribus cetate erosis ; suturd impressd ; aperturd 

 ovali, supra angulatd, intus ccerulescente, margine paidulum 

 incrassato, albido ; peristomate acuto, lined tenui nigrd cir- 

 cumdato. 



Long. -^ ; lat. ^6^ unc. 



The Bornean specimens being scarcely adult, the description is 

 drawn up from individuals in my cabinet, which have long been there 

 without any locality assigned. — W. M. 



28. LiTTORiNA scABRA. Helix sc, Linn. 



29. LiTTORiNA MELANOSTOMA, Gray, Zool. of Beechey's Voy. 



30. LiTTORiNA ALBICANS, uobis. L. testd ovato-oblongd, acu- 

 minatd, tenui, albidd, apice Icevi, nitente ; anfractibus 7 vel 8, 

 quorum 5 ultimi striis numerosis paulatim crescentibus ornati ; 

 ultimus rotundatus, cetate varicosus, strid unicd majore, quasi 

 carinatus, striis ad basim minoribus circumdatus ; aperturd 

 rotund ato-lunari, lacted ; peristomate subreflexo. 



Long. ^ ; lat. -^ unc. 



A delicate species, of a milk-white hue, the older specimens having 

 many varices produced by the previous reflexions of the outer lip. 



31. Cerithium obtvsdm. Lam.; Zool. of the Samarang, Moll, 

 pi. 13. fig. 3. 



32. Cerithium unicarinatum, nobis. C. testd turritd, tenui, 

 apice truncato, hinc inde varicosd, cinered, longitudinaliter pli- 

 catd, interstitiis longitudinaliter striato-rugosis ; suturd parum 

 impressd; anfractibus vix rotundatis, regulariter crescentibus ; 

 ultimo acute carinato, infra carinatn crebristriato; aperturd 



