E. Jørgensen. 



G. marina (Ltngb.) Kutz. 



KuTZ. Bacill. p. 128, pi. 17, f. XXIV, 1—6. Van Heubck Synops, p. 163, 



pi. 53, figs. 10—11. Diatoma m. Lyngb. Hydroph. p. 180, pi. 62 A. 



Rare: Stamsund r. 



Distribution: Frequent on the coasts of Europe. Africa. 

 America. Ceylon. 



G, oceanica Ehrb. 

 Eheb. Mikrogeol. pi. 19, f. 36 a, pi. 18, f. 87 a. 



Perhaps ought to be united witli the preceding species. 

 Frequent: Stamsund r +, Svolvær +c, Østnestiord r -f, 

 Gaukværø r. Stene r. 



var. niacilenta (W. Sm.) Gritn. 



Grun. in Wien Verh. 1862. Van Heurck pl. 53, 2, f. 16. G. macileiita W. Sm. 



Biit. Diat. II, p. 43, pl. 61, f. 382. 



Svolvær +, Stene r. 



Distribution: Frequent on the coasts of Europe. Greenland. 

 Cape Horn. Indian Ocean. 



G. arctiea Cl. 



Cl. Diat. Spitsb. 1867, p. 664, pi. 23, f. 1. Van Hel-rck Synops, pl. .53, 2, f. 3. 



G. africana Ehrb. Mikrogeol. pi. 35 A, XX, figs. 1—2, (uon 1. c. pi. 18, 



f. 86 a, b). 



Very rare: Stene ri'. 

 Distribution: Arctic regions. 



12. Nitzschieæ. 

 Barillai'ia socialis Greg. 



Cf. above p. 103. 



Not unfrequent: Stamsund -f, The Østnes Fiord r, Gauk- 

 værø r. 



Distribution: Coast of Western and Northern Europe. Arctic 

 regions. West Indies. 



NitKsrliia Hass. 

 a. Pandiiriforiuis Grun. 



N. panduriforuiis Greg. 



Greg. Riat. oi Clyde p. 529, pi. XIV, f. 102. Van Heurck Syno])s. p. 172, 



pi. 58, figs. \~i. 



Rare: Svolvær r, Stene r. 



Distribution: Western coasts of Europe. Baltic. Adriatic 

 Sea. Finmark. Spitsbergen. Indian Ocean. The Red Sea. Cape 

 Horn. 



N. constricia ((ireg.) Griin. 



Gri'n. in Cl. et Griin. Arct. Diat. 1880, p. 71. Tryblioiwlla c. Greg. Micr. 



Journ. Ill, p. 40. |)1. 1, f. 13. 



Rare: Stamsund r, Svolvær r, (iaukværø r. 

 Distribution: Western Europe. The Mediterranean. Cape 

 of Good Hope. Cape Horn. Ceylon. 



b. Trj-hlionella (W. Sm.) Grun. 



N. naricularis (Bréb.) Grun. 



Grun. in Cl. and Grun. Avet. Diat. p. 67. Van Heurck Synops, p. 171, pl. 57, 



f. 1. Srtrirella varicidaris Bréb. in Kutz. Spee. Alg. p. 36. 



Very rare: Stene r. 



Distribution: Coasts of the North Sea and Western Europe. 

 Spitsbergen (uncertain, Cl.) 



N. punctata (W. Sm.) Grun. 



Grun. in Cl. et Grun. Arct. Diat. p. 69. Van Heurck Sraops. p. 171. pi. 57, 



f. 2. Trvhliondla p. W. Sm. Brit. Diat. I, p. 36, pi. X, f. 76 a. 



Rare: Stamsund r, Svolvær r, Stene r. 

 Distribution: Coasts of the North Sea and of Western Europe. 

 The Baltic. The Mediterranean. 



N. coarctata Grun. 

 Grun. 1. c. p. 68. Van Heurck Synops, pl. 57, f. 4. 



Several specimens which seem to belong here were found: 

 Gaukværø r. 



Distribution: The Mediterranean; Japan; Cape Horn. 



N. (Tryhlionella rar.?) litoralis Grun. 



Grun. in Cl. and Grun. Arct. Diat. p. 75. Van Heurck Synops, p. 172, pi. 59 



figs. 1-3. 



Very rare: Stamsund r. 



Distribution: Frequent in fresh and brackish water. 



c. Apiculatæ Grun. 



N, apiciilata (Greg.) Grun. 



Grun. in Cl. et Grun. Arct. Diat. p. 73. Tri/blionella a. Greg. Micr. Journ. V, 



p. 79, pi. 1, f. 43. 



Very rare: Svolvær, r. 



Distribution: Coasts of the North Sea and Western Europe. 

 Finmark. Greenland. 



N. acuminata (W. Sm.) Grutn. 



Grun. in Cl. et Grun. Arct. Diat. p. 73. Van Heorck Synops., p. 173, pi. 58, 



figs. 16—17. Tryhlionella a. W. Sm. Brit. Diat. I, p. 36, pi. 10, f. 77. 



Rare: Svolvær r, Stene ]■. 



Distribution: Coasts of Endand. The Mediterranean. 



N. uiargiunlata Grun. 



Grun. 1. c. p. 72. 



var.? didyma Grun. 1. c. 

 Van Heurck Synops, pl. 58, figs. 14—15. 



Rare: Stamsund r, Svolvær r. 



Distribution: Frequent on the coasts of Europe. Arctic re- 

 gions. Indian Ocean. Pacific Ocean. 



N. hungarica Grun. 



Grun. in Wjpu Verb. 1862, p. 568, pi. 22, f. 13. Van Heurck Synops, p. 173, 



1,1. .53. f. 19. 



Species from brackish water. 



Very rare: Svolvær, r. 



Distribution: Frequent in fresh and brackish water. 



