BIHANG TILL K. SV. VET.-AKAD. IIANDL. BAND 21. AFD. III. N:0 2. 31 



Kv. 32, 34, Nu. 3, 5, U, 11», 39, Ks. 15, 20, Jm. 6, Km. 

 10, V. 12, S.-K. 7, -n, 33, Na. 35, Gl. 43, 47, Gl. I). 45. — 

 Frequent. 



f. excisa (Grun.) — V. H. XXXV, B c. 



Ventral margin indented in the middle of the valve. 

 Striae 20 in 0,oi mm. 



S.-K. 33. — Rare. 



E. impressa Ehb. var. angusta Grun. — V. H. XXXV, 1. 



Valve slightly arcuate, narrower towards the rounded, 

 scarcely capitate ends; with slightly coneave dorsal margin; 

 0,03 to 0,035 mm. in length, 0,o>i4 to 0,oo5 mm. in breadth. 

 Striae 17 to 19 in 0,oi mm. 



Kv. 16, 32, Ks. 15, S.-K. 7, Jm. B, Km. 30, Tj. 42. — 

 Somewhat frequent. 



Thongh nearly connected with E. pectinalis Eabii., espe- 

 cially the var. minor, this form must, I think, constitute a dif- 

 erent species, the striae being much closer than in E. pectinalis. 



E. pectinalis Rabh. 



Valve slightly arcuate with rostrate, protracted ends. 

 Striae 10 to 13 in 0,oi mm., inequidistant. 



Var. elongata. — V. H. XXXIII, 16. 



Valve 0,02 to 0,i5 mm. in length, 0,oo8 mm. in breadth. 

 Striae 13 in 0,ui mm. 



Kv. 16, 28, Nu. 5, 18, 37, Km. 10, Jm. 6, Na. 35, Tj. 42. 



— Not rare. 



Var. stricta Rabii. — V. H. XXXIII, 18. 



Valve 0,04 to 0,055 mm. in length, 0,oo6 mm. in breadth. 

 Striae 12 to 13 in 0,oi mm. 



Nu. 2, Ll. 21. — Rare. 



Var. compacta A. Cl. n. var. 



Valve 0,04.5 mm. in length, 0,016 mm. in breadth. Striae 

 13 in 0,01 ram. 



Kv. 1. — Rare. 



Var. minor (KtJTZ.) Rabh. — V. H. XXXIII, 20. 



Valve 0,0 2 5 to O, o 3 mm. in length, 0,ood mm. in breadth, 

 sometimes slightly coneave on the dorsal side. Striae 11 to 

 13 in 0,0 1 mm. 



Kv. 1, 9, 32, 34, Km. 10, Nu. 17, Ll. 21, Gl. D. 44, Ke. 49. 



— Somewhat frequent. 



