552 



164. Ch. Brightwelli Cl., Cl. Diat. f. arct. S. tab. II., lig. 7 b, c. 

 Vaags Ejde (Sy de ro). 



165. Ch. decipiens Cl., Cl. Diat. arct. S. tab. L, fig. 5. 

 Vestmanhavn (Stromo); Vaags Ejde (Syde ro). 



166. Ch. Diadema (Ehr.) Gran., Gran. N. N. Exp., lab. II., fig. 18. 

 Spores. Skaalefjord (O s ter 6); Vestmanhavn (Stromo. 



167. Ch. cinctum Gran., Gran. N. N. Exp. tab. IL, ligs. 23— 27. 



Kirkebo Stromo). 



All the above-mentioned species of Chætoceros occur only singly, 

 and partly as fragments. 



TIIALASSIOSIRA Cl. 1872, V. H. Tr. d. Diat., p. 436. 



168. Thalassiosira gravida Cl., Spores = Cosimodiscus subglobosus 

 Cl. & Grim., A. S. Atl. LVIIL, fig. 44. 



Rare. Vestmanhavn (Stromo). 



MELOSIRA Ag. 1824, V. H. Syn., p. 197. 



169. Melosira nummuloides (Bory) Ag., V. H. Syn. tab. LXXXV., 

 ligs. 1—2. 



Not common. Between Thorsvig and Kvalvig, Kalbakfjord (Stromo). 



170. M. Borreri Grev. var. hispida Cast., V. H. Syn. tab. LXXXV., 

 lig. 8. 



Rare. Kalbakfjord (Stromo). 



171. M. sulcata (Ehr.) Ktz., W. Sm. Syn. tab. LUL, fig. 338. 



Found in 15 of the gatherings from Bordo; Ostero; and Stromo, 

 but never in a large quantity in any single gathering. 



PODOSIRA Ehr. 1840, V. H. Tr. d. Diat., p. 447. 



172. Podosira dubia (Ktz.) Grim., V. H. Syn. tab. LXXXIV., 



ligs. 13—14. 



Not common. Glibre and Fuglefjord (Ostero); Kvivig and Thors- 

 havn (Stromo). 



HYALODISCUS Ehr. 1854, V. H. Tr. d. Diat., p. 448. 



173. Hyalodiscus scoticus (Ktz.) G run. — Podosira bormoides 



W. Sm. Syn. lab. XLIX., lig. 327. 



Found in 11 galherings from Bordo; Ostero; Stromo; and 

 Syde ro. Usually dispersed; only in two gatherings from Kalbakfjord 

 (S l ro m o nol rare. 



