41 



instructa ; anfr. 3-|- utrinqne apparcntibus, sutura impressfi. 

 Apertura ampla, perobliqua, lata, lunata. Diam. ^ ; alt. jV P^ll. 



Inhabits Ousiina. W. S. 



Very like to P. albiis and deflectus ; perhaps the same that 

 MiddendortF refers to under the former name, as from Kamts- 

 chatka. 



Segmentina lucida. T. parva, tenuis, orbicularis, dilute 

 cornea, radiatim viridi-lineata, supra fornicata, infra poculiformis, 

 vix perforata ; anfr. 4, ultimo lato, declivi ; sutura impressa. 

 Apertura ampla, postice acuta, antice rotundata ; fauce denticulis 

 armata. Alt. -^^ ; lat. ^ poll. 



Inhabits Loo Choo. W. S. 



Smaller and more elevated than the following, with quite a 

 different surface and color. 



Segmentina usta. T. depressa, orbicularis, concavo-convexa, 

 nitida, umbrina, late umbilicata ; anfr. 6, apicalibus arctissimis, 

 excavatis, ultimo amplo, declivi ; sutura canaliculata. Apertura 

 perobliqua, anguste lunata ; fauce in fundo quadridentata. Alt. 

 y^j ; diam. ^-^ poll. 



Inhabits Loo Choo Islands. W. S. 



Resembles in color S. Largillierti^ which is larger, less pol- 

 ished, more largely umbilicated. 



Paludina histrica. T. ovato-conica, variabilis, tenuis, stri- 

 atula, rufo-cornea ; anfr. 6 ventricosis, postice tabulatis, ultimo ad 

 peripheriam subangulato, albido ; sutura profunda. Apertura 

 rotundato-ovata, subeffusa ; peristomate simplici, nigrescente, um- 

 bilicum parvum subtegente. Dimens. 1X| poll.; l^^Xy^^ poll, 

 etc. 



Ditches in paddy-fields, Ousima and Loo Choo. W. S. 



BiTHYNiA DiVALis. T. miuuta, imperforata, ovato-conica, 

 solidula, Icevis, olivacea ; anfr. 3-[- ventricosis, ultimo permao-no. 

 Apertura parva, ovata, verticalis ; peritremate continue ad colu- 

 mellam flexuoso. Axis y-g- ; diam. ^^ poll. 



Inhabits China, vicinity of Canton. Mr. Bow ring. 



The genus is somewhat equivocal. It has an operculum more 

 like that of a true Paludina than of any other genus. 



AssiMiNEA DEBiLis. T. globoso-couica, solidula, luteo-cornea, 

 arete umbilicata ; anfr. 5 tabulatis, ultimo ad peripheriam sub- 



