48 Acta Societatis pro Fauna et Flora fennica, VIII, n. 2. 



Foss. Ob. 91, Lk. 104. 



E. hebridicum (Greg.) Grim. — CI. M. D. 37. 



This form seems to be comparatively constant. The valve 

 measures in length 0,0 3 to 0,0 4 m. m. in breadht 0,0 7 to 0,00 8 

 m. m. The raphe is bordered by a narrow area. The striae are 

 indistinctly granulate and 10 in 0,oi m. m. 



Lim. 21, 25, Lt. 30. 



Foss. Nyl. 87, Sa. 89. 



PI. II, fig. 16, 17. 



E. gracile (Ehb.) Rabh. — V. H. Ill, 20 to 22. 



Sb. 2, 4, 6, 89, Lim. 20, 23, 25. 



Foss. Nyl. 87, Sa. 88, 89, Tb. 90. 



Var. lunatum W. Sm. — V. H. Ill, 23. 



Ab. 35, 36, 52, Sb. 5, 10, Lim. 21, 22, Lt. 33, 35. 



(jomplionema Ag. 



G. geminatum Ag. — W. Sm. B. D. XXVII, 235. 



Ab. 50, Lad. 66, 85, 86, Kon. 41, Sb. 5, 14. 



G. constrictum Ehb. — V. H. XXIII, 5 — 8, including G. capi- 

 tatum. 



Ab. 36, 37, 38, 45, 46, 47, 48, 50, Al. 56, 57, 59, Kon. 40, 

 41, 43, Sb. 4, 5, 6, 18. 



Foss. Sa. 88, Ta. 94, 95, Ob. 91 (var. italicum), Lk. 104. 



G. Augur Ehb. — V. H. XIII, 28, 29. 



Ab. 38, Kon. 40. 



G. acuminatum Ehb. — V. H. XXIII, 15 — 18, including var. 

 coronatum, laticeps, trigonocephalum. 



Ab. 36, 38, 44, 45, 46, 47, 48, Lad. 86, Kon. 40, Sb. 4, 5. 

 11, 18, 



Foss. Nyl. 87, Sa. 88, 89, Ta. 94, 96, 97, Tb. 90, Ob. 92, 

 Lk. 93, 104. 



G. elongatum W. Sm. — V. H. XIII, 22. 



Ab. 36, 37, Sb. 5, 6. 



Foss. Sa. 89, Lk. 93. 



G. apicatum (Ehb.?) Gl. — Valve clavate, acuminate, 0,0 2 2 

 to 0,0 2 5 m. m. in length and 0,0 6 to 0,0 07 m. m. in breadth. 



