8 ARKIV FÖR BOTANIK. BAND 14. N:0 9. 



Caloiieis Cl. 



Caloneis furcata n. sp. — Pl. 1, f. 2. 



Valve linear, slightly gibbous in the middle, with sub- 

 rostrate, broad ends, 50 \l in length, 8 [j. in breadth. Axial 

 area narrow; central area a broad, transverse fascia. Striae 

 fine, parallel, about 22 in 10 [x, longitudinal lines indistinct. 

 On each side of the valve, there is a long and narrow marking 

 or furrow. 



Foss.: Kk. Knjäsha, rare. Marine? 



Caloneis alpestris (Grun.) — V. H. Syn. Tab. 12, f. 30. 

 Foss.: Sat. Panelia. 



Distr. {jreshw., alp. reg.): Sweden(foss.), Bornholm, Faenö; 

 Austrian alps, Savoy. Austr. 



Caloneis permagna Bail. — V. H. Syn. Tab. 11, f. 1. 



Foss.: Nyl. Kyrkslätt. 



Distr. {brack, w.): Belgium, N. America. 



Caloneis Liber (W. Sm.) var. genuina Cl. Syn. Nav. 

 D. I, p. 55. — Donkin b. D. Tab. 9, f. 5. Greg. D. of 

 Clyde, Tab. 9, f. 18. 



Foss.: Ka. Viborg-dep. (Cleve 1894); Kk. Knjäsha. 

 Distr. {mar.): Greenland, East Arctic Sea, North Sea, 

 Mediterranean, Indian and Pacific Oceans, Antarctis. 



Caloneis Liber (W. Sm.) v. transitans n. var. — PI. 1, f. 3. 



Valve broadly linear, with rounded ends, 75 [j. in length, 

 15 [1 in breadth. Axial area narrow, suddenly dilated in the 

 middle to a rather large, orbicular space. Striae c. 15 in 

 10 ]}., crossed in the middle by a distinct longitudinal line. 



Foss.: Kk. Knjäsha {mar.). 



This variety comes near to Caloneis brevis /. angiistior 

 Grun. A. D. Tab. 1, f. 26, but is still more slender, thus 

 making a transition from Caloneis Liber to C. brevis. The 

 central area is larger than in the former, but smaller than in 

 the latter. As the longitudinal lines are distinct, I have put 

 it to C. Liber, though the elongated variety of C. breviSy 

 quoted above, also has been delineated with distinct lines. 

 In the genuine C. brevis, no traces of such lines appear. 



