. Botany of the Faeröes, based upon Danish investigations. Botany -- Faroe islands. 508 19. D. tenuis (Cleve) Gran, Plankton des Norw. Nordmeercs, 1902, p. 172; I), mediterranelis v. tennis Cleve, Fish. Board for Scot- land 1897, p. 300, fig. 14. This s]>ecies also is found once only and in a l'ew specimens (Sep- tember). In the North Atlantic Ocean the two species often occur together. XI. GUINARDIA Perag., 1892. 20. G. flaccida (Castr.) Perag., Monogr. Rhiz., p. 107, PI. I, figs. 3—5. A temperate, neritic species found along the west coast of Enrope and Africa (also in other Oceans). Arou
. Botany of the Faeröes, based upon Danish investigations. Botany -- Faroe islands. 508 19. D. tenuis (Cleve) Gran, Plankton des Norw. Nordmeercs, 1902, p. 172; I), mediterranelis v. tennis Cleve, Fish. Board for Scot- land 1897, p. 300, fig. 14. This s]>ecies also is found once only and in a l'ew specimens (Sep- tember). In the North Atlantic Ocean the two species often occur together. XI. GUINARDIA Perag., 1892. 20. G. flaccida (Castr.) Perag., Monogr. Rhiz., p. 107, PI. I, figs. 3—5. A temperate, neritic species found along the west coast of Enrope and Africa (also in other Oceans). Around the Færoes only found in the some samples from Klaksvig (August), in which Lauderia borealis occurs. XII. RHIZOSOLENIA (Ehbg.) Btw., 1858. 21. R. delicatula Cleve, Plankt. of the North Sea, Kgl. Vetensk. Akad. Handl., Bd. 32, No. 8, 1900, p. 28, fig. 11; Leptocylindrus dani- cns Schiitt, Jahrb. f. wissensch. Botanik, XXXV., 1900, PI. XII, figs. 13—24, 33; non Cleve. A boreal, neritic species found in the English Channel and the North Sea (and but rarely around the Azores) is moreover characteristic of the plankton of leeland (according to (iran). Found four times at the Færoes in July—August, but sparingly. 22. R. faeroénsis n. sp. Cells short- cylindrieal with blunt angles, length 50— 80 |M, breadth 40—70 ja ; spine very Ihin and short, forming the centre of a bluntly triangular depression on the valve; nunie- rous connecting rings; chromatophores rather numerous; occurs singly or in cbains. Related to R. delicatula and R. Stolterfothii. This very peeuliar Rliizosolenia, which at the (irst glance resembles Ceratanlina, seems to l)e an outpost of the genus, forming a transition to the Lauderia-group and perhaps also to Ditylum; il comes nearest to R. delicatula, of which I have given a ligure from the same sample for comparison. It occurs in plankton from July 1900 and August 1902 and is ralhcr common in some of the samples; il was also found in July 1897, judg
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