10 ERNST ØSTRUP 



Diploneis Puella (Schum.?) Cl. Cl. Syn. I, 92. V. H. Trt., Tab. IV, 



fig. 158 (Nav. ell. minima). 



Myvatn (N.) Rd., Akureyri (N.) B. P. 

 Area : Eur., Af., Spb. 



Diploneis subovalis Cl. Cl. Syn. I, 96, Tab. I, fig. 27, Tab. nost. I, 

 fig. 10. 



Störi Kroppur (S.W.) B. P. 



Area: New Zealand. 



I have given a delineation of the form found by me, as it differs 

 somewhat from Cleve's figure. About its identity with Dipl. subov. I have 

 no doubt whatever. 



Naviculæ orthostichæ Cl. Cl. Syn. I, 107. 



Navicula cuspidata Ktz. Cl. Syn. I, 109. V. H.Trt., Tab. IV, fig. 190. 

 5 samples (S. 1, SW. 1. N. 1. E. 2). 

 Area : Ubiquist, B. E. 



Var. ambigua Ehr. Cl. Syn. I, 110. V. H. Trt., Tab. IV, fig. 192 

 (Nav. amb.). 



9 samples (S. 3, S.W. 2, N. 2, E. 2 . Hot spring: 1. 

 Area: Ubiquist, Grl. 



Var. HeribaudiM. Per. Cl. Syn. I, 110. Herib. Auv., Tab. IV, fig. 16. 

 Reykjavik (S.W.) B. P. 

 Area : Eur. (fossil.). 



Gyrosigma Hassall 1845. Cl. Syn. I, 112. 



Gyrosigma acuminatum (Ktz.) Cl. Cl. Syn. I, 114. V. H.Trt., Tab. 

 VII, fig. 274 (Pleuros. acum.). 



4 samples (S.W. 2, N.W. 1, N. 1). 

 Area: Eur, Af, As. 



*Gyrosigma attenuatum (Ktz.) Cl. Cl. Syn. I, 115. V. H.Trt., Tab. 

 VII, fig. 271 (Pleuros. atten.). 



Reykjavik (S.W.) C. H. O.. Grimsey (N.) O. D. 

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



Frustulia Ag. 1824. Cl. Syn. I, 121. 



Frustulia islandica sp. nov.. Tab. nost. I, fig. 11. 



Long: 46 //, lat: 9 /x. 



Valva lanceolata, apicibus leniter attenuatis. Raphe intra costas 

 siliceas duas sita. Nodulis terminalibus ab apicibus remotis. Striis 

 subtilissimis et, quoad perspicere potui, radiantibus, media in parte 

 valvæ deficientibus ibique fasciam latam relinquentibus. 



Sælsundslækur (S.) A. F. 



