52 ARKIV FÖR BOTANIK. BAND 14. N:0 9. 



Panduriformes Gr un. 

 Nitzschia panduriformis Greg. — V. H. Syn. Tab. 58, f. 1. 

 Foss.: Sat. Panelia, rare (Litorina-dep.). 

 Distr. {mar.): South Europe, warmer Oceans. 



Nitzschia panduriformis Greg. var. delicatula Grun. 

 — A. B., p. 71, Tab. 5, f. 92. 

 Foss.: Kk. Knjäsha. 

 Distr. {mar.): East Arctic Sea (Grunow), Faeroes (0strup). 



Apiculatae Grun. 



Nitzschia marginnlata Grun. var. genuina Grun. — 

 A. D. Tab. 5, f. 93. V. H. Syn. Tab. 58, f. 16, 17. 

 Foss.: Kk. Knjäsha, not rare. 

 Distr. {mar.): West and East Arctic Sea; ubiq. 



Bilohatae Grun. 



Nitzschia (hybrida var.?) pellucida Grun. — A. D., p. 

 80, Tab. 5, f. 96. 



Foss.: Kk. Knjäsha. 



Distr. {mar.): East Arctic Sea. 



The form I have met with is only 28 — 40 [x in length, 

 8 u. in breadth (valve), and thus somewhat smaller than the 

 original N. pelludica, for which Grunow states a length of 

 55 — 70 a. No striation was seen, but always traces of a 

 central nodule. 



Bacillaria Grun. 



Nitzschia socialis Greg. — V. H. Syn. Tab. 61, f. 8. 

 Foss.: Kk. Knjäsha. 



Distr. {mar.): West (the var. kariana Grun.) and East 

 Arctic Sea, North Sea, Baltic, Atlantic etc., America. 



Sigmata Grun. 



Nitzschia Sigma W. Sm. var. Sigmatella Grun. — V. H. 

 Syn. Tab. 66, f. 6, 7. 



Foss.: Kk. Knjäsha, Koudajärvenpää; Sat. Panelia. 

 Distr. {mar.): Arctic Sea; Europe. 



