MARINE DIATOMS FROM THE COASTS OF ICELAND 373 



Grammatophora angulosa Ehr. var. islandica Ehr. Per. 1. c., 358, 

 Tab. I.e., tigs. 1415. 



125 samples (S. 23, S.W. 61, N.W. 10, N. 21, E. 10). 

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



Grammatophora arcuata Ehr. Grun. 0st. Diat., 1862, 420, Tab. XI, 

 fig. 7. 



21 samples (S. 7, S.W. 5, N.W. 2, N. 6, E.I). 

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



Grammatophora marina (Lyngb.) Ktz. P. D. mar., 353, Tab. 

 LXXXVII, figs. 6-8. 



155 samples (S. 31, S.W. 98, N.W. 11, N. 12, E. 3). 

 Area: Ubiquist. 



Grammatophora oceanica Ehr. var. macilenta W. Sm. Per. D. mar., 

 355, Tab. LXXXVII, figs. 14 17. 



28 samples >S. 3, S.W. 17, N.W. 4, N. 4 . 

 Area : Eur. 



Grammatophora oceanica forma minuscula Per. Per. 1. c. , 355, 

 Tab. 1. c., fig. 13. 



66 samples (S. 19, S.W. 38, N.W. 4, N. 5). 

 Area : Eur. 



In a sample from Skerjafjordur (S.W.\ H. Js. I have found a curved 

 Gram. oc. macil., of which I have given a figure in tab. nost. fig. 15. It 

 has the dimensions: long. 73 //, lat. 6.5 //. 



Grammatophora serpentina Ehr. Per. D. mar., 356, Tab.LXXXVIII, 



figs. 2 5. 



Vestmannaeyjar (S.. 2 samples', H. Js. 

 Area: Ubiquist. 



Rhabdonema Ktz. 1844. V. H. Trt., 360. 



Rhabdonema adriaticum Ktz. V. H. Trt., 360. Tab. XII, fig. 486a. 



Vestmannaeyjar (S., 3 samples), H. Js. 

 Area: Ubiquist. 



Rhabdonema arcuatum (Ag.) Ktz. V. H. Trt., 360, Tab. XII, fig. 487 a. 



303 samples (S. 38, S.W. 126, N.W. 21, N. 77, E. 36, S. L. 5). 

 Area: Ubiquist, Grl., A. S. 



Rhabdonema arcuatum is a form which, as regards its outline, is 

 variable, and in the samples examined by me, it appears with recti-linear 

 as well as with more or less curved sides (see Cleve's var. ventricosum 

 in Cl. Arct. S., 24, tab. IV, fig. 21). The curved species may perhaps be 

 identical with Rhabd. Crozieri Grun. Concerning this see Mann, Albat. 

 322 under Tessela catena Ehr. 



