— 100 — 



profunde sub anfr. penult. sito, subperpendiculari 

 angulum obtusum distinctum formans. Long. 18 ^/g, 

 diam. 13, alt. S'/g mm.; apert. long. 12^/3, lat, 9 mm. 

 Hab. in Sibiria ad Jenissei adversus Chantojskoj (lat. 

 68^ 5'), forma minor in insulis Briochowskij (lat. 70° 

 390 et ad Selivaninskoj (lat. 65° 55'). 



Physa (Aplexa) hypnorum Lin. var. polaris n. 



Testa ovato-elongata, turrita, solidula, laevis, nitidissima, 

 fulvo-rufa, spira elongata, acutiuscula vel acuta ; anfr. 

 6, planulati, superne distincte obtuse angulati, suturam 

 versus declivi ; apertura superne angulata, infra anguste 

 rotundata, columella subcontorta, cum pariete sat con- 

 vexo angulum perdistinctum formante, margine dextro 

 extense sed regulariter eurvato, simplici, acuto. Long. 

 13, diam. 5^2 mm.; apert. long. 7, lat. 3 mm. 



Hab. in Sibiria prope Jenissei ad Schaitanskoj (lat. 71° 

 55'), Mesenkin (lat. 71° 20') et Worogowa Selo (lat. 

 60° 50'). Forte species. 



Physa (Isidora?) sibirica nov. sp. 



Testa ovato-elongata, imperforata, irregulariter elevato- 

 striatula, solida, nitidula, fuscocornea; spira elonga- 

 tula, conica, acuta; anfr. 5^/2 (6), convexi, ad suturam 

 plano-depressi , sutura alba infra obscure marginata 

 sat profunda separati, penultimus antice ventricosus; 

 apertura dimidiam testae partem paullo superans, 

 columella subcontorta, pariete convexo S formi, parte 

 inferiori subhorizontali , margine columellari subverti- 

 cali, stricto. Long. 9^/2, long, apert. 6, spirae3^/3 mm. 



Hab. in Sibiria prope Jenissei ad Sopotschnaja Korga 

 (lat. 71° 40'). 



