1898-1902. No. 36.] SUMMARY OF GEOLOGICAL RESULTS. 15 



Archimedes sp., B. 



Polypora niartis FISCHER, B; S.V. 



Polypora biannica KEYS , B. 



Polypora pustulata TOULA, B. 



Polypora orbicributa KEYS., B; S.V. 



Polypora micropora STUCK , B. 



Phyllopora cf. borealis STUCK., B; S.V. 



Productus boliviensis D'ORB., B. 



Productus inflatus McCnESM., B; S.V. 



Productus Stuckenberyi KROTOW, B. 



Productus tartaricus TSCHERN., B. 



Productus pseudoaculeatus KROT., B. 



Produclus tastubensis TSCHERN., B. 

 *Productus Frami TSCHERN., B. 



Productus irginae STUCK.. B ; S. V. 



Productus Humboldti D'ORB , B. 



Productus Aagaardi TOULA, B; S.V. 



Productus simensis TSCHERN., B. 



Productus Konincki VERN., B; S.V. 



Productus cancriniformis TSCHERN., B. 



Productus Weyprechti TOULA, B. 



Productus porrectus Kur., B. 



Productus timanicus STUCK., B. 



Marginifera involuta TSCHERN., S.V. 



Marginifera typica WAAG. var. septentrionalis TSCHERN., B. 



Marginifera Clarkei TSCHER.V., B. 



Derbyia grandis WAAG., B. 



Beticularia lineata MART., B. 



Reticularia guadalupensis SHUM , B. 

 *Spirifer Scheii TSCHERN., B. 



Spirifer condor D'ORB., B. 



Spirifer fasciger KEYSERL., B. 



Spirifer Marcoui WAAG., B. 



Spirifer tastubensis TSCHENR., B 



Spirifer lyra Kur., B. 



Spirifer Nikitini TSCHERN., B. 



Spirifrrella Saranae VERN., B. 



Spiriferella Keilhavi v. BUCH., B. 



Spirif'erella artiensis STUCK., B. 



Spiriferella Parry ana TOULA, B; S.V. 



Spiriferella Draschei TOULA, S. V. 



Spiriferella sp., B. 



Spiriferina cristata SCHL., B. 



Camaraphoria Kutorgae TSCHERN., B. 



Camaraphoria mutabilis TSCHERN., B. 



Rhynchopora Nikitini TSCHERN., B ; S. V. 

 *Notothyris polaris TSCHERN., B. 



Dielasma Moelleri TSCHERN., B. 



Aviculopecten (Deltopecten ?) Bouei KEYSERL. non VERN., B. 



Of 55 forms, which are specifically determined, no less than 42 are 

 also known from the Schwagerina-Yiorizon of the Ural and the Timan, 

 thus very nicely giving ihe age of the limestone as high Upper 

 Carboniferous according to the Russian stratigraphic system ; and 



