MARINE DIATOMS FROM THE COASTS OF ICELAND 371 



Synedra provincial Grun. Trans. Mic. Soc. XVIII, 166; V.H.Syn., 

 Tab. XL., fig. 8. 



Reykjavik (S.W.), Grid. 

 Area: Eur. 



The species found by me is a forma minor (long. 54 n'). The length 

 of the typical Syn. provinc. is given by Grunow as: 65 110//. 



Synedra pulchella Ktz. V. H. Trt., 309, Tab. X, fig. 402. 



15 samples (S. 3, S.W. 2, X.W. 5, N. 4, E.I). 

 Area: Eur., As., Am., Grl., A. S. 



Thalassionema Grun. V. H. Trt., 319. 



Thalassionema nitzschioides Grun. Per. D. mar., 320, Tab. LXXXI, 

 figs. 1718. 



Eyrarbakki (S.), H. Js. 

 Area: Eur., Am. 



Thalassiothrix Cl. & Grun. 1880. V. H. Trt., 321. 



Thalassiothrix Frauenfeldi Grun. Per. D. mar., 321, Tab. LXXXI, 

 fig. 15. 



Prestbakki (N.), H. Js. 

 Area: Eur., As., Grl. 



Fragilaria Lyngbye 1819. V. H. Trt., 323. 



Fragilaria hyalina (Ktz.) Grun. V. H. Trt., 324, Tab. XI, fig. 443. 



5 samples (S.W. 2, E. 3). 

 Area: Eur., Afr., As. 



Fragilaria striatula Lyngb. V.H.Trt, 324; Per. D. mar., Tab. LXXXI, 

 fig. 5. 



82 samples (S. 12, S.W, 30, N,W. 5, N. 13, E. 20, S. L. 2). 

 Area: Eur., Am., Aust., Grl., A. S. 



Fragilaria vitrea Ktz. Per. D. mar., 326, Tab. LXXXI, fig. 2. 



28 samples (S. 3, S.W. 6, N.W. 5, N. 11, E. 3). 

 Area: Eur., Am. 



Var. minima Per. D. mar. 1. c., fig. 3, I have found interspersed among 

 the main-species. 



Rhaphoneis Ehr. 1844. V. H. Trt., 329. 



Rhaphoneis amphiceros Ehr. var. rhombica Grun. V. H. Trt., 330, 

 Tab. X, fig. 395. 



BuSir (S.W.), H. Js. 

 Area: Ubiquist. 



