10 ERNST 0STRUP 



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

 fig. 15cS (Xav. ell. minima). 



Myvntn N. Hd.. Akureyri X. B. P. 

 Area: Eur.. Af.. Sph. 



Diploneis subovalis Cl. Cl. Syn. I, 9(5, Tab. I, fig. 27, Tab. nost. 1. 

 li. 10. 



Stori Kroppur (S.W.) B. P. 



Area: NV\v 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. 



Naviculae orthostichae Cl. Cl. Syn. I, 107. 



Mavicula cuspidata Ktz. Cl. Syn. I, 109. V. H. Trt., Tab. IV, fig. I'm. 

 5 samples (S. 1, SW. 1. X. 1. K. 2 

 Area : Ubiquist. B. E. 



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

 (Xav. amb.). 



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

 Area: Ubiquist, Grl. 



Var. Heribamli M. Per. Cl. Syn. I, 110. Herih. Auv., Tab. IV, fig. 1(5. 

 Reykjavik (S.W. B. P. 

 Area: Eur. fossil.. 



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



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

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



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

 Area: Eur. Af., As. 



'Gyrosigma attenuatum (Ktz.) Cl. Cl. Syn. I, 11."). V. H.Trt., Tab. 

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



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: 4(5 //, lat: 9 //. 



Valva lanceolata, apicibus leniter attenuatis. Raphe intra costas 

 siliceas duas sita. Nodulis terminalibus ab apicibus remotis. Striis 

 subtilissimis el, quoad perspicere polui, radiantibus, media in parte 

 valvse deficientibus ibique fasciam latam relinquentibus. 



Sselsundslaekur (S.) A. F. 



