205 



A', littorca Okun. {'.) 

 Hei'RCK Synoiis. pl. .VI. f. 21. S. thcimnlis r. UttnraUs Cj 

 V.WS. Aivt. Diat. n. TH. 



Spathulatæ Gut' 



A^ annularis W. Sm. 

 I, p. 40, |,l. 13. f. 117. Van Heokck Synops, p. 



pl. ti2, 



Very rare: .stamsund r. 11:3 ji lon-; 7 keel punda on 10 n. i father frequent: Stamsund r. Svolvær +, Ostncstiord r, 



Similar to X lu/hiida, but is long-er and nai-rower, with more distant Gaukværø -\-. 



j Distriliiition: Frequent on the western and northern eoasts 



keel puncta and more excentric keel. Also Stene, r r. 

 Diftribiitio» : Newcastle. Lysekil (Sweden). 



e. Bilohata- Crits-. 



N. bilobata W. S>i. 



W. Sm. Brit. Diat. I. p. 4->, pl. 15, f. 113. Van Heurck S.vnops. p. 175, 



pl. 60, f. 1. 



Veiy rare: Ostnestiord. r. 



Distribution : Frequent on the coasts of Europe (the most north- 

 ern ones excepted). Pacific Ocean. 



N. hyhrida (Srun. 



Cf. above p. 103. 



Perhaps derived from tlie plankton. 

 Very rare: Stamsund r. 

 Dixfrihntion: Cf. above p. 103. 



A'. Mitchelliana Greenl. 



Cf. above p. 104. 



Very rare: Ostnestiord r, Stene r. 



Distributwn : North America. Arctic reirions. 



f. Insignes Grun. 



N. insignis Greo. 

 Greg. Micr. Jouvn. V, p. 80, pi. 1, f. 4<i. 



Not unfrequent: Stamsund r, Ostnestiord r, Gaukværø r, 

 Stene r. 



Distrihidion : Coasts of Western and Northern Europe. Arctic 

 regions. Adriatic Sea. Red Sea. 



var. notabilis (Jrun. 

 Grun. in Cl. et Grin. Aret. Diat. p. 84. Van HEnRCK Synops, pl. 51, f. 5. 



Very rare: Gaukværo r. 470 |). long; 9—10 striæ on 10 \i. 

 Distribution: The Mediterranean. 



var. spathnlifera Grun. 

 Van Hecrck Synops, pl. 6], f. 3. 



Very rare: Stamsund r. 



Distribution: The Mediterranean. West Indies. 



N. Smithii Ealfs. 

 Halfs in Pbitch. Inf. p. 781. V.\n Helrck Synops, pl. 61, f. 4. 



Not unfrequent: Stamsund +, Stene r. 

 Distribution : Coasts of Western Europe. Adriatic Sea. Fin- 

 mark (var. marginifera Gkun.). 



of Europe. The Mediterranean. Arctic regions. Ceylon. Cape 

 Horn. 



N. spathnlata Brkb. 



Bréb. in W. !-M. Brit. Diat. I, p. 40, pi. 31, f. 268. Van Heirck Synops, p. 177. 



pi. 62, figs. 7—8. 



Somewhat rare: Stamsund r, O.stnestiord, Gaukværo r. 

 Distribution : Frequent on the western and northern coasts of 

 Eui'ope. Tile Mediterranean. Arctic regions. 



A', distans Greg. 

 Greg. Diat. of Clyde, p. 530, pi. XIV, f. 103. Van Hei-rck Synops, pl. 62, f. 10. 



Rai'c: stamsund r (several specimens); Ostnestiord r. 



Distribution: Coasts of the North Sea. The Mediterranean. 

 Red Sea. Australia. Baffin's Bay and Davis' Strait, Cape Wan- 

 karema (Cl., vai'ieties). 



li. Signiata Grun. 



A'. Sigma (KCtz.) W. Sm. 



•W. Sm. Brit. Diat. I, p. 39, pi. 13. f. 108. Si/nedm s. KuTZ. Bacill. j). 67. 



pi. 30, f. 114. 



Frequent: Stamsund -{-. Svolvær +. Ostnesfiord -fr Gauk- 

 værø r +, Stene r. 



Distribution : Cosmopolitan. 



i. Lanceolatæ Gkun. 



N. lanceolata W. Sm. 



W. Sm. Biit. Diat. I. p. 40, pl. XIV. f. 118. Van Heurck Synops, p. 182, 



pl. 68. figs. 1—4. 



I have two times seen the wavy longitudinal lines, described 

 and illustrated by W. Smith. They were more distinct than the 

 transverse striæ. 



Very rare: Stamsund r. Gaukværo r, Stene r. 



Distribution: Frequent on the coasts of Europe, the most 

 northern ones only excepted. Indian Ocean. 



k. Nitzcliiella (Rabenh.) Grun. 



A', longissima (Bréb.) Ealfs. 



Cf. above p. 101. 

 Very rare: Gaukværo r. 



Distribution: Coasts of the North Sea and Western Europe. 

 The Mediterranean. West Indies. Indian Ocean. 



