281 



177. E. Diodon Ehr., V. H. Syn. lab. XXXIII, fig. 6. 

 Kirkehokaiiip, Thorshavn, Hojvig (S trom 6). 



Formå minor, V. H. 1. c, fig. 5. 

 Gjerdumrejn (Bor do). 



178. E. lunaris (Ehr.) Grun., V. H. Syn. tab. XXXV, figs. 3—4. 

 Hcre and there. 



179. E. flexuosa (Kiitz.) var. pachycephala Grun., V. H. Syn. 

 tab. XXXV, fig. 7. 



Rare. Svartafos (S trom 6), Ejde (Ostero). 



CERATONEIS Ehr. 1840. V. H. Syn., p. 148. 



180. Ceratoneis Arcus Kiitz., V. H. Syn. tab. XXXVII, fig. 7. 



Not rare in many of the gatlierings, one from I3osdalafos (.Vaago) 

 consists mainly of this species. 



SYNEDRA Ehr. 1831. V. H. Syn., p. 149. 



181. Synedra pulchella Kiitz., V. H. Syn. tab. XL, fig. 27. 

 Here and tliere. Plankton. 



Var. Smithii Ralfs, V. H. Syn. tab. XLI, fig. 4. 

 Nol so; Bosdahifos (Yaago'. 

 Var. lanceolata O'Meara, V. H. 1. c, fig. 7. 

 Hest 6; Trangisvaag (Sj^dero). 



182. S. UIna (Nitzsch.) Ehr., V. H. Syn. tab. XXXVIII, fig. 7. 

 Var. danica Kiitz., V. H. 1. c, fig. 14 a and b. 



Var. vitrea Kiitz., V. H. 1. c, fig. 12. Il 



Synedra Ulna is one of the commonest Diatoms of the 

 Færoes; most frequent is the variety danica, fig. 14 a of Van 

 Heurck. It occurs abundantly in several of the gatlierings, e. g. 

 from Trangisvaag (S3'derd), Vedvig (Videro), Vestmanhavn and 

 Kirkebokamp (S trom 6). Plankton. 



Var. contpacta m. Fig. 47 '^'^Vi. 



L. 0,112 mm., Br., greatest, 0,075 mm., in the middle 

 0,06 mm. Striæ 9 in 0,01 mm. 



Sfightly constricted. Striæ absent from the centre. This 

 variety must doubtless be regarded as a transitional form 

 of Sijnedrn Goiilardii Bréb. in Htt. (Cl. & Grun. arc. Diat. 

 tab. VI, fig. 119), which is, however, shorter and broader. 

 S Goiilardii has been found in Buenos Ayres, Porto Rico, 

 Kamtchatka and near Jenisei. 



Found in a gathering from the Færoes labelled: »Green 

 algæ from a swamp on Nol so«. Fig. 47 



