204 



E. Jergensen. 



G. marina (Lyngb.) Kutz. 



Kutz. Bacill. p. 128, pi. 17. f. XXIV. 1—6. Van Heurck Synops. p. 163, 



pi. 53, figs. 10—11. Diatoma w. Lyngb. Hydropb.. p. 180, pi. 62 A. 



Rare: Stamsund r. 



Distribution: Frequent on the coasts of Europe. Africa. 

 America. Ceylon. 



G, oceanica Eheb. 

 F.heb. Mikrogeol. pi. 19, f. 36 a, pi. 18, f. 87 a. 



Perhaps ought to be united with the preceding- species. 

 Frequent: Stamsund r+, Svolvser + c, Ostnesriord r+, 

 Gaukvsero r. Stene r. 



rar. macilenta (W. Sm.) Geun. 



Grun. in Wien Verb. 1862. Van Heueck pi. 53, 2, f. 16. G. macilenta W. Sm. 



Brit. Diat. II. p. 43. pi. 61, f. 382. 



Svolvser +• Stene r. 



Distribution: Frequent on the coasts of Europe. Greenland. 

 Cape Horn. Indian Ocean. 



G. arctica Cl. 



Cl. Diat. Spitsb. 1867, p. 664, pi. 23, f. 1. Van Heurck Synops. pi. 53. 2, f. 3. 



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



f. 86 a, b). 



Very rare: Stene rr. 

 Distribution: Arctic regions. 



12. Nitzschiese. 

 Itacillaria socialis Greg. 



Cf. above p. 103. 



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

 vsero r. 



Distribution: Coast of Western and Northern Europe. Arctic 

 regions. West Indies. 



\il /'»cliia Hass. 

 a. Panduriformis Grun. 



N. pandnriforiuis Greg. 

 Greg. Diat. oi Clyde p. 529, pi. XIV, f. 102. Van Heurck Synops. p. 172, 



pi. 58, figs. 1—3. 



Rare: Svolvser r, Stene r. 



Distribution: Western coasts of Europe. Baltic. Adriatic 

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

 Horn. 



N. constricta (Greg.) Grun. 



Grun. in Cl. et Grun. Arct. Diat. 1880, p. 71. TrijU'wneUa c. Greg. Micr. 



Joum. Ill, p. 40, pi. 1, f. 13. 



Rare: Stamsund r, Svolvser r, Gaukvsero r. 

 Distribution: Western Europe. The Mediterranean. Cape 

 of Good Hope. Cape Horn. Ceylon. 



b. Trvblionella (W. Sm.) Grun. 



N. navicularis (Breb.) Grun. 



Grun. in Cl. and Grun. Arct. Diat. p. 67. Van Heurck Synops. p. 171, pi. 57. 



f. 1. Sitrirella navicularis Breb. in Kutz. Spec. 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 Synops. p. 171. pi. 57, 



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



Rare: Stamsund r, Svolvser r. Stene r. 



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

 The Baltic. The Mediterranean. 



N. coarctata Gran. 

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



Several specimens which seem to belong here were found: 

 Gaukv;iTo r. 



Distribution: The Mediterranean; Japan; Cape Horn. 



N. (Tryblionella Tar.?) litoralis Grun. 

 (.kin. 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. Apiculatse Grun. 



N. apiculata (Greg.) Grun. 

 Grun. in Cl. et Grun. Arct. Diat. p. 73. Tryblionella a. Greg. Micr. Journ. V, 



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



Very rare : Svolvser, r. 



Distribution: Coasts of the North Sea and Western Europe. 

 Finmark. Greenland. 



N. acuminata (W. Sm.) Grun. 



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



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



Rare: Svolvser r, Stene r. 



Distribution: Coasts of England. The Mediterranean. 



N. marginulata Grun. 

 Grun. 1. c. p. 72. 



rar.? didyma Grun. 1. c. 

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



Rare: Stamsund r, Svolvser r. 



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

 gions. Indian Ocean. Pacific Ocean. 



N. luingarica Grun. 

 Grun. in Wien Verh. 1862, p. 568. pi. 22, f. 13. Van Heurck Synops. p. 173, 



pi. 53, f. 19. 



Species from brackish water. 



Very rare: Svolvser. r. 



Distribution: Frequent in fresh and brackish water. 



