FRESH-WATER DIATOMS FROM ICELAND 25 



Navicula curte-striata sp. nov., Tab. nost. Ill, fig. 32. 



Long: 22 //, lat: 7 /i, str. 10 in 10 /<, subtiliter punctatis. 



Valva elliptice-lanceolata. Extremitatibus medianis raphes in 

 eandem partem vergentibus. Striis marginalibus, aream apicalem 

 latam lanceolatam relinquentibus, leniter radiantibus, apices versus 

 convergentibus. 



Ingjaldsholl (S.W.) H. Js. 



Navicula dicephala (Ehr.) W. Sm. Cl. Syn. II, 21. V. H. Trl., Tab. Ill, 

 fig. 138. 



56 samples (S. 8, S.W. 16, N. 12, E. 19, s. 1. 1). Hot springs: 7. 

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



Var. undulata var. nov., Tab. nost. Ill, fig. 33. 



Long: 25//, lat: 8 /<, str. 10 in 10 //. 



Valva triundulata, ceterum ut in typo. 



Torfastadir (S.) A. F. In a hot spring. 



This form has nothing to do with Nav. Motshii Meist. (Schw. 147, 

 Tah. XXII, fig. 16), neither with Nav. Integra W. Sm. var. gibba Pant, in 

 Pant. Bal. 47, Tab. V, fig. 113. 



Navicula exilior sp. nov., Tab. nost. Ill, fig. 34. 

 Long: 13 //, lat: 4 //, str. 10 in 10 //. 



Valva anguste-elliptica. Raphe area hyalina angusta cincta. Striis 

 per totam valvam radiantibus. 

 Reykir (S.) A. F. 



Navicula Gastrum Ehr. Cl. Syn. II, 22. V. H. Trt., Tab. Ill, fig. 134 

 (the two first figs.). 



Hvita (S.) A. F. 

 Ubiquist, Grl. 



Var. exigua Grim. Cl. Syn. II, 23. V. H. Trt. 1. c. 3rd fig. 



10 samples (S. 7, S.W. 1, N. 1, E. 1). 

 Area: Eur., Aust. 



Navicula gracilis Ehr. Cl.Syn. II, 17. V. H. Trt., Tab. Ill, fig. 109. 

 Laugafells Laug (N.) St., Hornafjordr (E.) St. Hot spring: 1. 

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



Var. schizonemoides M. V. H. Cl. Syn. 1. c. V. H. Trt. 1. c., fig. 110. 



8 samples (S. 5, E. 3). Hot spring: 1. 

 Area: Eur. 



Navicula hungarica Grun. Cl. Syn. II, 16. Grim. Oest. Ung., Tab. 

 XXX, fig. 42. 



7 samples (S. 2, S.W. 3, N. 1, E. 1). 

 Area: Eur., As., Am., B. E. 



