MARINE DIATOMS FROM THE COASTS OF ICELAND 363 



Monoraphideae 



Achnantheae Cl. 1895. Cl. Syn. 11,163. 

 Rhoicosphenia Grunow 1860. Cl. Syn., II, 165. 



Rhoicosphenia curvata Ktz. Cl. Syn., 11,165; V. H. Trt., Tab. VII, 

 fig. 319. 



143 samples (S. 17, S.W. 74, N.W. 16, N. 27, E. 7, S. L. 2). 

 Area: Ubiquist, Grl., A. S. 



Cocconeis (Ehr. 1835) Grun. 1868. Cl. Syn., II, 168. 

 Subgenus Cocconeis Cleve 1895. Cl. Syn., II, 168. 



Cocconeis grata A. S. Cl. Syn., II, 172; Per. D. mar., Tab. Ill, 

 figg. 67. 



12 samples (S.I. S.W. 10, N.I). 

 Area: Eur., Am. 



Cocconeis levis sp. nov. Tab. nost., fig. 11, a, b. 



Hypotheca: Long.: 23 ,, lat.: 10/*, striis inconspicuis. 



Valva elliptica: Raphe segre perspicienda, area hyalina angu- 

 stissima cincta. 



Epithecap): Long.: 16/<, lat.: 7 u. 



Valva forma Hypothecs. Raphe deest. Striis in margine modo 

 difficillime perspiciendis. 



SkagafjorSur (N.), Grid. 



This small species offers very few marks for identification. I think 

 my fig. b, in spite of its smaller size, may represent the epitheca. Both 

 valves occur in the same slide. This species somewhat resembles the form 

 delineated in A. S. Atl., tab. CXCII1, fig. 2, which Cleve refers to Coc. 

 placentula. 



Cocconeis Scutellum Ehr. var. genuina Cl. Cl. Syn., II, 170; 

 V. H. Trt., Tab. VIII, fig. 338. 



160 samples S. 18, S.W. 74, N.W. 15, N. 38, E. 15). 

 Area: Ubiquist, Grl., A. S. 



Cocconeis Scutellum Ehr. var. orn a ta Grun. Cl. Syn.; I.e., V. H. 

 Syn., Tab. XXIX, figs. 67. 



9 samples (S. 1, S.W. 5, N. 3). 

 Area: Eur., A. S. 



Cocconeis Scutellum Ehr. var. parua Grun. Cl. Syn., 1. c., V. H. 

 Trt., Tab. VIII, fig. 339. 



8 samples (S. 2, S.W. 6), 

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



24* 



