40 Acta Societatis pro Fauna et Flora fermica, VIII, n. 2. 



C. Lacustres. 



S. dilatata Ehb. — CI. Gr. A. D. Ill, 62. 



Lad. 85, 86. 



S. Phcenicenteron Ehb. — V. H. IV, 2. 



Ab. 36, Kon. 41, Lad. 86, Sb. 13, 16, 19, Lim. 21, 25, 

 Lt. 30. 



Foss. Nyl. 87, Ta. 94, 95, 97, Tb. 90, Ka. 89, Ob. 92, Lk. 104. 



Var. lanceolata (S. linearis Ehb.). — S. lanceolata (Kiitz.) 

 Gran. — This form is so closely connected with the last, that no 

 limit can be traced. 



Ab. 36, 37, 49, Kon. 41, Sb. 1, 2, 8, 9, 10, 12, 15, Lim. 23. 



Foss. Ka. 88, 89, Ta. 94, 96, Tb. 90. 



S. anceps Ehb. — V. H. IV, 4—6. 



Ab. 36, 47, 48, Kon. 40, 41, Sb. 1, 2, 3, 4, 6, 9, 12, 15, 16, 

 Lim. 23, 25. 



Foss. Ka. 89, Ta. 97, Tb. 90, Lk. 93, 104. 



Var. fossilis CI. — Valve lanceolate, 0,0 9 m. m. in length 

 and 0,oi6 m. m. in breadth, with capitate and flattened ends. 

 Striae fine, about 23 in 0,oi m. m., oblique. 



PI. II, fig. 18. 



Foss. Sa. 88. 



The same variety occurs also in the Degernas deposit 

 (Sweden). 



Auomoeoueis Pfitzer. 



A. sphaerophora Kiitz. — V. H. XII, 2, 3. 

 Kon. 41. 



A. serians (Breb.) Kiitz. — V. H. XII, 7. 

 Lim. 23, 25, Lt. 33. 

 Foss. Sa. 89. 



A. brachysira Breb. — Nav. serians forma minor et minima 

 Grun. in V. H. XII f. 8, 9. 



Lim. 20, 22, 25, 27, Lt. 30, 32, 34. 



Foss. Sa. 88, 89. 



A. Zellensis Grun. — V. H. XII, 14. 



Lim. 23, 24, 26. 



A. exilis Grun. — V. H. XII, 11, 12. 





