106 



columella simplici, postice callo lato induta. Axis ^ ; diara. \ 

 poll. 



Streams and marshes on Hong Kong Island. (Wright.) 



Very much like a small L. modicella. 



Ancylus gaulus. T. oblique pyramidata, apice ad quad- 

 rantem posteriorem longitudinis, dextrorsum inclinato, obtuso ; 

 epidermide luteo-cornea, superne fusca. Apertura rotundato- 

 ovata, intus plumbea. Long. -i ; lat. \ ; alt. r ] ff poll. 



Inhabits Cape of Good Hope. W. S. 



A solid, well rounded species, without any salient chai'acters. 



Planorbis spirillus. T. parva, discoidea, utrinque concava, 

 tenuis viridi-cornea, plerumque liris ad quatuor prope aperturam 

 instructa ; anfr. 3-j- utrinque apparentibus, sutura impressa. 

 Apertura ampla, perobliqua, lata, lunata. Diam. £ ; alt. ^o P°H« 



Inhabits Ousima. W. S. 



Very like to P. albus and dejlectus ; perhaps the same that 

 Middendorff refers to under the former name, as from Kam- 

 tschatka. 



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

 cornea, radiatim viridi-lineata, supra foi-nicata, infra poculiformis, 

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

 Apertura ampla, postice acuta, antice rotundata ; fauce denticulis 

 armata. Alt. T \j- ; 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. 

 ^ ; 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-comea ; anfr. 6 ventricosis, postice tabulatis, ultimo ad 

 peripheriam subangulato, albido ; sutura profunda. Apertura 



