204' Zoological Society. 



4. Thalotia suTURALis, A. Adams. Th. testa conicd, subper- 

 foratd, virescenti, lineis purpureis longitudinalibus imdulatis 

 ornatil, transversitn liratd, longitudinaliter striatd; anfractibus 

 plants, supra suturam elevatis ; suturd canaliculatd, basi plani- 

 usculd ; columella brevi, basi tuberculo terminatd ; labro intus 

 Icevi, viridi. 



Hab. Cape Upstart, Torres Straits, Australia, under stoues, low 

 water (Drinff). 



5. Thalotia tricingulata, A. Adams. Th. testd conicd, ini- 

 perforatd, nigrd, lineis albis longitudinalibus ornatd ; anfrac- 

 tibus angulatis, ultimo cingulis tribus transversis prominentibus 

 instructo, basi convexd, cingulis concentricis nigro alboque «?'- 

 ticulatis ornatd ; labio ad basin tuberculato ; apertiird subro- 

 tundatd, intus albd ; labro intus liris elevatis, atro-marginato. 



Hab. 1 



6. Thalotia crenellifera, A. Adams. Th. testd elevate- 

 conicd, imperforatd, rufescente, rubro maculosd ; spird acumi- 

 natd, apicejnibro ; anfractibus planulatis, liris confertis, cre- 

 nellatis, transversis, interstitiis oblique longitudinaliter striatis ; 

 anfractu ultimo subangulato, basi convexiusculd ; aperturd sub- 

 quadratd, intus albd ; columelld albd, incurvatd, antich truncatd. 



Hab. Australia. Mas. Cuming. 



Genus 14. Monodonta, Lamarck. 



Monodon, Schweiger. — Monodontes, Montfort. — Odontis, Sow. — 



Trochidon, Swains. — Diloma, Phil. — Trochulus, sp. Humph. 



1. Monodonta rugulosa, A. Adams. M. testd ovato-conoi- 

 ded, depressd, atro-fuscd, fasciis latis luteo-albis irregulariter 

 pictd, cingulis rotundatis interrtqitis ornatd; columelld basi 

 bituberculatd, canali parallelo instructd, dente magno acuto ter- 

 minatd ; labro duplicato, intus lirato. 



Hab. ? 



2. Monodonta circumcincta, A. Adams. M. testd ovato- 

 conoided, imperforatd, Itevi, nitidd, crassd, cingulis rubris albo 

 viridi maculatis alternantibus pictd; anfractibus convexis ; 

 columelld basi tubercidatd, dente magno acuto terminatd ; labro 

 duplicato, intus lirato. 



Hab. Island of Ticao, on the stones on reefs at low water {H. C). 



3. Monodonta tueerculata, A. Adams. M. testd ovato- 

 conoided, imperforatd, crassd, viridescenti, cingulis tuberculo- 

 rum oblongorum violaceorum ornatd; anfractibus convexis; colu- 

 melld basi tritubercxdatd, canali parallelo instructd, dente pro- 

 minente acuto terminatd ; labro duplicato, intus lirato. 



Hab. ? 



Subgenus Aradasia, Gray. 



Operculum suborbicular, paucispiral. 



Aradasia, Gray, in Mrs. Gray's Figures of Molluscous Animals, p. 90. 



— ? Otavia, Cantr. 



1, Monodonta sulcifera, A. Adams. M. testd globoso- 



