425 



turn proximum vix attigens ; faure valde contracto ; peristomate 

 modice reflexo ; fistula suturali exili valde appressa. Operculum 

 corneum, arete spirals, apice centrali. Axis ^ ; diam. ^ poll. 

 Inhabits Ilong Kong, China. 



Cyclotus illotus. T. planorboidea, rudis, rubiginosa, sub- 

 tus late et profunde umbilicata ; anfr. 4 rotundatis, sutura sim- 

 plici, impressa. Apertura circularis, anfractum proximum haud 

 amplectens ; labro simplici. Diam. 3 ; axis 1 poll. 



Inhabits Loochoo. 



In form and general aspect greatly resembling Cycl. suturalis, 

 Sowb., but is smaller, and has a simple suture. 



Cyclostoma bakbata. T. parva, ovato-conica, rufo-cornea, 

 liris numerosis volventibus et striis incrementi tenuibus lamellosis 

 decussata, decussationibus barbara gerentibus ; anfr. 5 rotun- 

 datis, sutura canaliculata. Apertura postice subangulata ; peris- 

 tomate simplici, vix expanso ; umbilico modico, profundo. 



Diameters ^ inch. Inhabits Ousima. 



Two of the ridges on the outer whorl and one on the others 

 are more conspicuous than the rest. 



Cyclostoma citharella. T. parva, subglobosa, tenuis, 

 rufa, laminis incrementi tenuibus ornata, ad peripheriam prope 

 aperturam biangulata, satis umbilicata. Apertura circularis, 

 peristomate simplici anfractum proximum tantum attigente. 

 Operculum subrotundum, paucespiratum, margine attenuate. 



Diameters -^ inch. Inhabits Ousima. 



Were it not for the operculum, it might be mistaken for Helix 

 harpa, Say. 



Cyclostoma musiva. T. ovato-conica, cornea, radiatim rufo 

 strigata, subtus ad peripheriam rufo tessellata, modice umbilicata, 

 striis volventibus ad 5 arata, lineis incrementi conspicuis decus- 

 sata ; anfr. 5 rotundatis, sutura canaliculata. Apertura rotun- 

 data, peristomate simplici. Axis ^- ; diam. ^ inch. 



Inhabits — ? (probably Japan). 



The surface is conspicuously and beautifully relieved by the 

 decussating lines. 



