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



Archimedes sp., B. 



Polypora martis FISCHER, B; S.V. 

 . Polypora binrntica KEYS , B. 



Polypora pustulata TOULA, B. 



Polypora orbicribata KEYS., B; S.V. 



Polypora micropora STUCK., B. 



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



Productus boliviensis D'ORB., B. 



Productus inflatus McCnESN., B; S.V. 



Productus Stuckenbergi KROTOW, B. 



Productus tartaricus TSCHERN., B. 



Productus pseudoaculeatus KROT., B. 



Produdus 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 KUT., B. 



Productus timanicus STUCK., B. 



Marginifera involuta TSCHERN., S.V. 



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



Marginifera ClarJcei TSCHERN., B. 



Derbyia grandis WAAG., B. 



Reticularia Hneata 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 KUT., B. 



Spirifer Nikitini TSCHERN., B. 



Spiriferella Saranae VERN, B. 



Spiriferella Keilhavi v. BUCK., B. 



Spiriferella artiensis STUCK., B. 



Spiriferella Parryana 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-hoiizon of the Ural and the Timan, 

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

 Carboniferous according to the Russian stratigraphic system ; and 



