102 — 



Valvata aliena nov. sp. 



Testa perforata, riraata vel raro subexumbilicata, oblique 

 globoso-trochoidea, nitidula, Cornea, subtus et ad su- 

 turara albida, supra medium anfractus ultirai fascia 

 lata virescenti brunnea vel olivacea ornata, spira rufes- 

 centi-brunnea, sat regulariter subeostulato-striata, subtus 

 saepe distincte spiraliter lineata et pleruraque parce 

 malleata ; anfr. 4^/2, sutura mediocri, raro profundius- 

 cula, separati, convexiusculi, ultimus ventrosus, rotun- 

 datus, altior quam latus ; apertura magna , intus in 

 palato ad basin et superne infra suturam valide mar- 

 garitacea, rotundata, superne paulisper angulata, mar- 

 ginibus forte arcuatis discontinuis, in pariete semper 

 sat longe disjunctis, callo tenui vel saepius linea 

 obscura tenuissima vix conspicua junetis, externo 

 acuto, recto, columellari ad perforationem expanso, 

 non reflexo. Diam. ö^/g — 6^/3, alt. 5 — 5^/3 



Hab. in Sibiria ad Jenissei, Nischnij Inbatsk (lat. 63^50'). 



Sphaerium levinodis nov. sp. 



Concha globosa, ventricosa; umbones rotundati, vix pro 

 rninuli ; dens cardinalis interior valvulae sinistrae tenuis, 

 in forma literae S curvatus. Long. 10, diam. 8, crass. 

 6^/3 mm. 



Hab. in Sibiria prope Jenissei ad Sargutskoj (lat. 68 '^ 50'). 



Sphaerium nitidum nov. sp. Cless. 

 Concha globosa, ventrieosa ; umbones tumidi, superne 



mammillis magnis; dens cardinalis interior valvulae 



sinistrae paullulum curvatus, ab interiore tantuin pro 



dimidia parte occultatus. 

 Hab. in Sibiria prope Jenissei ad Dudino (lat. 69° 15') 



et Lusino (lat. 68" 40'). 



