Diatoms. 



199 



H. subtilis Hah.. 

 Bail. New Spec. p. 10, f. 12. 



Perhaps only a form of the preceding species. 



Very rare: Stamsund r, Stene r. 



Distribution: Belgium. Scotland. Finmark (Cl.). America. 



Asia. 



\c -« Spec. p. 10. 



H. stelliger Bail. 

 Van Hecrck Synops. p, 213, pi. 84, figs. 1 



Frequent: Moskenstrommen I . Stamsund r -f-, Svolvser r. 

 Raftsund r, Brettesnes— Skroven r. Gaukvaero r. Stene r. 



Distribution: Western Europe. Virgin Isles. Spitsbergen 

 (uncertain, Cl.). 



Po<lo*ii'U hormoidcs (Mont.) Kutz. 



Kltz. Baoill. p. 52, pi. 29, E. 84. A. Schmidt Nunls. Diat. pi. 3, f. 40. 



Mebsira h. Most. PI. Boliv. 1839, p. 2. 



Rare: .Stamsund r, Svolvser r, Raftsund r. 

 Distribution: ('easts of the North Sea. Greenland. West 

 coast of South America. Adriatic Sen. 



?. Eupodiscese. 

 Ropi'ria tessellata (Eop.) Grun. 



Cf. above p. 98. 



Undoubtedly derived from the plankton. 



Rare: Stamsund r -f, Stene rr. 



Distribution: Western coasts of Europe and Africa. 



Anliscns senlptas (W. Sm.) Ralfs. 

 Ealfs in Pritch. Inf. p. 845, pi. 6, f. 3. Eupodiscus s. W. Sm. Brit. Diat. I, 



p. 25, pi. 4, f. 39. 



Common: Moskenstrommen + , Svolvaer c, Raftsund r, Bret- 

 tesnes— Skroven r, Ostnesfjord r, Gaukvsero c, Stene c. 



Specimens occur which are very similar to .1. ccelatus Ball. 

 (A. Schm. Atlas pi. 32, figs. 14—15), but connected with A. 

 seulptus by intermediate forms: Gaukvsero +, Stene r. 



Distribution: Coasts of the North Sea. Western Europe. 

 Mediterranean. America. A. ccelatus: Warmer coasts of the 

 Atlantic, Pacific and Indian Oceans. 



Eupndisoiis argns W. Sm. 



W. Sm. Brit. Diat., p. 24. A. Schmidt Atlas, pi. 92, figs. 7— 11 : pi. 97, tigs. 7 — 11. 



Van Heurck Synops. p. 209, pi. 117. 



Very rare: Moskenstrommen, rr, only one broken valve. 

 Distribution: Frequent on the coasts of the North Sea and 

 Western Europe. America. 



AuIhoocIescus Ehrb. 



A. Kittonii Arnott. 

 Arnott in Pritch. Inf. p. 844, pi. 8, f. 24. A. Schmidi Atlas pi. 30. tigs. 5—7. 



Rare: Moskenstrommen -}-, Raftsund r, Brettesnes— Skroven r, 

 Gaukvsero r. 



All specimens observed have 4 processus and no. or a very 

 small or inconspicuous, „central space". 



It is very remarkable that this tropical species occurs in 



Lofoten. Very likely fossil. At present 1 have no opportunity of 

 ascertaining whether the cells have really all been empty. 



Distribution: Wanner coasts of the Pacific Ocean, especially 

 frequent on the coasts of California. 



A. Johnsonii Ai 



Arnott in Pritch. Inf. p. S44. A. SCHMIDT Atlas pi. 36, figs. I. 2. 

 I. Kittonii vm: J. Kattk. Rev. of Aulacodisc. p. 376. 



Very rare: Raftsund r. Brettesnes— Skroven r. 



Differs from the preceding especially in having a conspicuous 

 central space and processus of a different shape. .1. Kittonii is. 

 however, said to vary considerably. 



Distribution: Tropical coasts of the Indian and Atlantic 

 < iceans. 



4. AsteroLimprcv. 

 Actinoptychus Ehrb. 



A. UndulatUS (Bah..?) Kalis. 



Cfr. above p. 98. 



Frequent: Moskenstrommen r +. Stamsund r -{-, Svolvser r, 

 Raftsund r. Brettesnes— Skroven r, Gaukvsero r, Stene r. 



Distribution: Coasts of Western Europe and the North Sen. 

 Arctic regions. Cape of Good Hope. 



A. splendens (Ehrb.?) Shadb. 



Shade, in Phitch. Inf. p. 840. Van Heukck Synops. pi. 110. figs. 1 — 2,4. 



Halionyx si>I<'h,Ihi* Ehrb. Abh. Berl. Ak. 1814; 



Very rare: Moskenstrommen r. Gaukvsero rr. 



Distrifattion: Coasts of the North Sea and the Baltic (Greifs- 



wald). 



Astcromphalns heptactis (Bbeb.) Kalis. 



Cf. above p. 98. 



Undoubtedly derived from the plankton. 

 Very rare: Moskenstrommen rr. 

 Distribution: Cf. above p. 98. 



5. Biddnlphiese. 



Biddiilpliia Gray. V. H. (including Amphitetrtis Ehrb., TriceraHum Ehrb., 



( 'eralaulus Ehhb.). 



B. pulchella Gbay. 

 Gray Arrang. of Hiit. Plants, I. p. 294. Van Heurck Synops. p. 204. pi. 97, 



figs. 1-3. 



Rare: Stamsund r. Raftsund r, Brettesnes— Skroven r, Stene r. 

 Distribution: Frequent on the western and southern coasts of 

 Europe. America. Africa. 



B. regina W. Sm. 



W. Sm. Brit. Diat. II, p. 50, pi. 40, f. 323. 



var. 



B. regina A. Scum. Atlas pi. 110, f. 18 (from Balearic Isle 1. 



The 3 median elevated parts of the valve hispid, not smooth 

 as stated by W. Sm. both in his discription and figure. 

 Very rare: Stene, a single valve. 



