FRESH-WATER DIATOMS FROM ICELAND 31 



Pinnularia mesolepta Khr. var. (ingusta Cl. Cl. Syn. II, 76. A. S. 

 Atl., Tab. XLV, fig. 62 (Nav. gracillima). 



17 samples (S. 3, S.W. 5, N.W.I, N. 3, E. 5). Hot spring: 1. 

 Area : Eur., Am. 



Var. polyonca Breb. Cl. Syn. 1. c. V. H. Trt., Tab. II, fig. 99. 



10 samples (S.I, S.W. 5, E. 4). 

 Area : Eur. 



Var. stauroneiformis Grun. Cl. Syn. 1. c. A. S. Atl., Tab. XLV, 

 figs. 5253. 



55 samples (S. 11, S.W. 20, N.W.I, N. 5, E. 18). Hot springs: 5. 

 Area: Eur., Af., Am., Grl., J. M., F. J. 



Pinnularia microstauron Ehr. Cl. Syn. II, 77. V. H. Syn, Tab. VI, 

 fig. 9 (Nav. biceps hybrida). 



11 samples (S. 3, S.W. 2, N.W.I, E.I). Hot spring: 1. 

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



Pinnularia Oculus 0st. 0st. 0stg. Ferskv., 269, Tab. I, fig. 6. 



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

 Area: Eur., Grl. 



Pinnularia perexilis sp. nov., Tab. nost. Ill, fig. 45. 



Long: 17 //, lat: 2,7 //. 



Valva linearis, in medio inflata, apicibus capitatis. Striis sub- 

 lilissimis et, quoad perspicere potui, per totam valvam radiantibus, 

 media in parte valvse aliquantulum spatiatis. 



Laugaa (S.W.) A. F. 



In spite of the striation radiating all throughout, at least as far as I 

 can see. 1 consider that .this small form requires its place among Finn, 

 capitatae. 



Pinnularia subcapitata Greg. Cl. Syn. II, 75. V. H. Trt., Tab. II, 

 fig. 91 (Nav. subc.). 



51 samples (S. 11, S.W. 16, N.W.I, N. 8, E. 15). Hot springs: 2. 

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



Var. paucistriata Grun. Cl. Syn. 1. c. V. H. Trt. 1. c,, fig. 92 (Nav. 

 sub. pauc.). 



Hvita (S.) A. F. 

 Area: Eur. 



Divergentes Cl. 1895. Cl. Syn. II, 77. 



*Pinnularia Brebissoni Ktz. Cl. Syn. II, 78. V. H. Trt., Tab. II, fig. 82 

 (Nav. Breb.). 



34 samples (S.I, S.W. 9, N. 6, E. 17, s. I. 1). Hot spring: 1. 

 Area: Eur., Af., As., Am., Grl., J. M., Spb. 



