113 



C. Gattung Dreissensia. 



I. R o s t r i f o r m e s. 



Gegi'ira'arf Grimmi bugensis 



I I 



Oitafcniär var. pontocaspica 



rostriformis 

 rostnformis 



IV. pont. Sf. Tschaudae rostriformis 



I baraganica 



latiuscula iniquivalvis 

 Michaudi anisoconcha decipiens— rostriformis 



Brusinai 

 Huoti 



///. p07lf. 



Stufe 



IL pont. 

 Stufe 



I. pont. ) 

 Stufe ] 



Theodori 

 exigua Stefanescui 



rostriformis 



anisoconcha var. transitoria- 



limplex 



Rossii 



superfoetata Rimestiensis 

 — Sabbae 



var. Simplex — var. typica 

 auricularis 



t 



(modioliformes) 



2. Carinatae. 

 Recente / ^ . •, , 



Epoche \ ^ourguignati Andrusovi polymorpha Pallasi caspia 



Quartär-} 

 Epoche I 



Bukowskii \ | /' 



! Diluvii....polymorph£ 



buldurensis 



caspia 



crassa 



Ob. Plio-l j impar 



cän (IV.\ \ : \ 



pont. St.)\ Fischeri ; irregularis polymorpha caspia 



I : I I 



Münster! Eichwaldi — 



Fischeri dubia Accurtii- 



Benedeni \ 



polymorph; 

 Berbestiensis 



Unt. Plio 



cän 



(Ill.pont 



Stufe) 



latro 



I 



cristellata { angusta-Retowski 



graecata 



filifera 



I 



II. pont.f cucullata — sp. — sp. ~ tenuissima .... ? angusta. 



Stufe > 



l serbica 



