18 ERNST ØSTRUP 



Cymbella incerta Grün. var. naviciüacea Grün. Cl. Syn. I, 170. 

 Cl. Grl. & Arg., Tab. XVI, fig. 11. 



7 samples (S.W. 5, E. 2 . Hot spring: 1 

 Area : Eur., Grl. 



Cymbella islandica sp. now, Tab. nost. II, fig. 21. 



Long: 100 /<, lat: 11 u, str. 12 in 10 //, subtiliter punctatis. 



Valva cymbiformi, margine ventrali fere recta. Apicibus aeutis. 

 Raphe area hyalina angusta, media in parte valvæ in aream longi- 

 nam, marginem ventralem versus aliquantum dilatata, cincta. 



Egilstaöir (E.) B. P. 



Cymbella Jonssoni sp. nov., Tab. nost. II, fig. 22. 



Long: 56 /«, lat: 9 //, str. 10 in 10^, apices versus densioribus, 

 indistincte punctatis. 



Valva anguste lanceolata. Raphe area hyalina, media in parte 

 valvæ in aream asymmetricam dilatata, cincta. Striis per totam 

 valvam radiantibus. 



Owing to the radiating striation and the non-symmetrical central 

 area I assume this form to be a Cymbella. It has probably nothing to 

 do with Cyrnb. inc. naviculacea. 



Cymbella lanceolata Ehr. Cl. Syn. I, 174. V. H. Tit., Tab. I, fig. 37. 

 99 samples (S. 25. S.W. 20, N. 12, E. 40. s. 1. 2). Hot springs: 2 

 Area: Eur.. Af. As., Am. 



Var. cornuta Ehr. Cl. Syn. 1. c. Øst. D. D., Tab. II, fig. 43. 



8 samples (S.W. 5, E. 3). 

 Area: Eur. 



Var. ventricosa A. Cl. A. Cl. Fini. P. 19, Tab. I, fig. 17 (C. lanc. in- 

 flata). 



Reykjavik (S.W. C. H. O. 

 Area: Eur. 



*Cymbella lapponica Grun. Cl. Syn. I, 165, Tab. IV, fig. 28. 

 26 samples S. 5, S.W. 10, N.W. 1, N. 1. E. 9). Hot spring: 1. 

 Area: Eur. 



Cymbella linearis sp. nov., Tab. nost. II, fig. 23. 



Long: 67 //, lat: 6,4 u, str. 12 in 10 ii. 



Valva lineari, apicibus rostratis. Raphe directa, fissuris termi- 

 nalibus recurvatis. Striis per totam valvam radiantibus, in apicibus 

 deficientibus, media in parte valvæ areolam rotundatam relinquen- 

 tibus, ceterum raphen attingentibus. 



Staôastaàur (S.W. H. Js. 



This form is without doubt a Cymbella; the peculiar course of the 

 raphe at the apices and the striation radiating throughout, seem to point 



