FRESH-WATER DIATOMS FROM ICELAND \i 



in parte valvæ modo conspicua. Striæ delicatissimæ, et apicales et 

 transapicales, adsunt. 



Reykjarfjord (N). In a hot spring. 



I am not sure as to the classification of this small form. Considering 

 the marginal line, I am inclined to place it under Neidium. 



Neidium productum (W. Sm.) Cl. Cl. Syn. I, 69. V. H.Trt., Tab. V, 

 fig. 218. (Nav. Irid. prod.). 



Staôastaôur (S.W.), H. Js., Syôri Gardar (S.W.) H. Js., Vatnsdalså N.) St. 

 Area: Eur., As., Am. 



Diploneis Ehr. 1840. Cl. Syn. I, 76. 



Dlploneis Boldtiana Cl. Cl. Syn. I, 92. Cl. Fini., Tab. II, fig. 12. 

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

 Area: Eur. 



Var. robusta A. Cl. A. Cl. Fini. 12, Tab. I, fig. 8. 

 Spôastadir (S.) A. F. 

 Area: Eur. 



*Diploneis elliptica (Ktz.) Cl. Cl. Syn. I, 92. V. H. Trt., Tab. IV, 

 fig. 156, 1st fig. (Navicula ell.). 



140 samples (S. 29, S. W. 35, N.W.I, N. 26, E. 42. s. 1. 7 . Hot 

 springs: 18. 



Area: Ubiquist, Grl., Fz. J. 



»Diploneis ovalis (Hilse) Cl. Cl. Syn. I, 92. V. H. Tit., Tab. IV, 

 fig. 156, 2d fig. (Nav. ell. ovalis). 



49 samples (S. 7, S.W. 12, N.W. 1, N. 8, E. 20, s. 1. 1). Hot spring: 1. 

 Area : Eur., Am., Aust., Grl., J. M., B. E. 



Var. oblongella Nægeli. Cl. Syn. I, 93. V. H. Trt., Tab. IV, fig. 157 

 (Nav. ell. oblong.). 



86 samples (S. 15, S.W. 16, N.W. 1, N. 5, E. 45, s. 1. 4). Hot springs: 5. 

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



Forma sabinfhitci, Tab. nost. I, fig. 9. 



Long: 38//, lat: 9 & 10 //, str. 14 in 10//, apices versus elensi- 

 oribus. 



Valva lineari, media in parte leniter intlata, ceterum Dipl. ov. 

 obi. simili. 



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



Doubtless it is this form about which Hustedt (Sudet., 67) under 

 Dipl. ov. obi. adds: "Zuweilen sind die Exemplare in der Mitte leicht 

 transapikal erweitert." 



Forma pumila Grün. Cl. Syn. I, 92. Grün. üest. Ung., Tab. XXX, 

 fig. 61 (Nav. ov. pum.). 



Hrossholt (S.W. A.'F. In a hot spring. 

 Area: Eur., As. 



