6 ERNST ØSTRUP 



medianis aliquantulum spatiatis, apices versus densioribus, per totam 

 valvam radiantibus. 



Reykholtshver (S.) A. F. 



Caloneis islandica sp. nov., Tab. nost. I, fig. 2. 



Long: 64//, lat: 10//, str. 20 in 10//. 



Valva lineari, apicibus rotundatis. Raphe area hyalina distincta, 

 media in parte valvæ in areolam rotundatam, in qua lunulæ duæ 

 adsunt, dilatata, cincta. 



Laugarvatn (E.) B. P. 



This form is probably related to, but hardly identical with Gal. 

 alpestris (Grun.) CI. 



Caloneis Jonssoni sp. nov., Tab. nost. I, fig. 3. 



Long: 35//, lat: 5,5 //, str. 16 in 10 jli. 



Valva lineari, in medio leniter contracta, apicibus rotundatis. 

 Raphe area hyalina lata, media in parte valva in fasciam dilatata, 

 cincta. Striis parallelis. 



Norôfjorôr (E.) H. Js. 



Caloneis Ladogenis Cl. Cl. Syn. I, 62. Cl. Fini., Tab. II, fig. 3. 



4 samples (S. 1, S.W. 1, N. 1, E. 1). 



Area: Eur. 



Caloneis obtusa (W. Sm.) Cl. Cl. Syn. I, 54. Donk. Br. Diät., Tab. 

 Ill, fig. 12 (Navicula Hebes). 



4 samples (all E.). 

 Area : Eur. 



Caloneis procera sp. nov., Tab. nost. I, fig. 4. 



Long: 104 //, lat: 12 //, str. c. 25 in 10 //. 



Valva lineari in medio leniter inflata. Raphe area hyalina, media 

 in parte valva paululum patescente, cincta. Striis parallelis. 



Vallanes (E.) B. P. 



This form has some similarity with Cal. Liber (W. Sm.) Cl., but has 

 not the terminal nodi so characteristic of this latter, and it was found 

 in a sample entirely containing fresh-water forms. The irregularly dis- 

 tributed ridges, illustrated in the figure, are possiby the outcome of a 

 diseased condition. 



*Caloneis Silicula (Ehr.) Cl. Cl. Syn. I, 51. V. H. Trt., Tab. V, fig. 

 207 (Navicula limosa). 



151 samples (S. 35, S.W. 39, N.W. 7, N. 22, E. 46, s. 1. 2). Hot 

 springs: 10. 



Area: Ubiquist, Grl., B. E. 



*Var. alpina Cl. Cl. 1. c. V. H. Syn., Tab. XII, fig. 21 (Nav. 

 Silicula). 



24 samples (S. 6, S.W. 10, N. 3, E. 5). Hot springs: 5. 

 Area: Eur., Grl., J. M., Spb., Fz. J. 



