380 



dispositae. Spira paulum coiiico-elevata. Anfractus 5 3 /4, vix con- 

 vexiusculi, regulariter crescentes, ultimus subtus valde convexus, 

 inflatus, antice breviter modiceque descendens. Apertura obliqua, 

 angulato-rotundata, mafginibus conniventibus, callo tenui junctis, 

 supero subrecto, externo et infero breviter expanso, columellari stricto, 

 obliquo, ad insertionem leviter dilatato. Peristoma hand incrassatum. 



Diameter major 14, d. minor 12, altitudo 7 mm. 



Hab. Saigo, prov. Uzen, ins. Nippon. 



2. Plectotropis delectabilis n. sp. 



Testa late et perspectivice umbilicata, lenticularis, acute cannata, 

 tenuis, subdiapliana, flavescenti-cornea, vix nitidula, leviter et irre- 

 gulariter striata, in statu integro hic illic strigis vel squamulis mem- 

 branaceis subtilissimis sparsim induta, sub epidermide decidua obsolete 

 spirali ter lineata. Spira depresse conica, apice subpapillato. Anfractus 

 6y 2 j apicales valde convexi, sequentes convexiusculi, ultimus superne 

 fere planatus , basi convexus , circa umbilicum leviter compressus, 

 antice plerumque leviter descendens, ad peripberiam acute carinatus; 

 carina denticulata, saepe albida, ciliis longis tenuibus ornata. Sutura 

 marginata, subdenticulata. Apertura valde obliqua, rotundato-qua- 

 drangularis, subsecuriformis. Peristoma margine supero tenui aut 

 recto aut vix expansiusculo, columellari subverticali et basali arcuato 

 valde incrassatis, albis breviter reflexis. 



Diam. maj. 19, d. min. lß 1 /^, alt. 7 3 /é mm 



- - i7, - - i53/ 4 , - sy 4 - 



- 17, - - 151/4, - 8 

 Hab. Naha, Okinawa-scbima, ins. Kiu-Kiu. 



PI. delectabilis m. differt a PI. elegantissima Pfeiffer, cui proxima, 

 testa minore, carina minus cuoriformi, sculptura subtiliore etc. 



3. Plectotropis pachysoma n. sp. 



Testa late et perspectivice umbilicata, umbilico ca 2 / 9 baseos testae 

 aequante, subgloboso-conoidea, pro genere modice depressa, subacuta 

 carinata, cornea, solida, leviter striata et squamulis membranaceis 

 brevibus triangularibus exasperata ; carina haud fimbriata. Spira 

 magis minusva elevata, convexo-conica; apex subacutus. Anfractus 7, 

 lente et regulariter accrescentes, convexiusculi, ultimus supra carinam 

 planatus, subtus convexus, ad umbilicum turgidus, antice paulum 

 breviterque descendens. Apertura obliqua, angulato-rotundata, mar- 

 ginibus late distantibus, callo modico junctis; margo externus ad 

 carinam angulatim protractus, columellaris aut obliquus aut subverti- 



