Nov. 
304, 
305. 
306. 
307. 
308. 
309. 
310. 
311. 
312. 
313, 
314, 
315. 
316. 
317. 
1904.] BOTANICAL SOCIETY OF EDINBURGH. 33 
Order PENNATA. 
Family TABELLARIACEA, 
Genus TABELLARIA, Ehrenb,. 
T. flocculosa (Roth) Kitz. O.—Kirkwall ; Finstown ; Stromness ; 
Hoy. Plankton of Loch Kirbister. S.—Scalloway ; near 
Neugles Water. Plankton of Neugles Water, Lochs Brindister 
and Trebister, and also of Loch Beosetter, Bressay. 
T. fenestrata (Lyngb.), Kiitz. O.—Finstown. Plankton of Loch 
Kirbister. S.—Neugles Water and plankton of Loch Brindister. 
Bressay, in ditches and in plankton of Loch Beosetter. 
Var. asterionelloides, Grun. O.—Plankton of Loch Kirbister. 
S.—Plankton of Loch Brindister, and of Loch Beosetter, 
Bressay. 
Family MERIDIONACE, 
Genus MERIDION, Ag. 
M. cirewlare, Ag, O.—In a well at Finstown ; Hoy. 
Family DriaAToMACE&. 
Genus pIATOMA, D.C. 
D. elongatum, Ag. O.—Finstown. Plankton of Loch Kirbister. 
S.Scalloway ; Lerwick (a short, thick form). 
D. hiemale (Lyngb.), Heib. 0.—Finstown. 
Var. mesodon (Kiitz), V.H. 0.—Kirkwall, in pond in a quarry. 
Family FRAGILARIACEA, 
Genus FRAGILARIA, Lyngb. 
F. capucina, Desmaz. O.—Kirkwall. 
F. mutabilis (W. Sm.), Grun. O.—W. of Kirkwall. S.—Near 
Lerwick. Plankton of Loch Trebister. 
F. Crotonensis (A. M. Edw.), Kitton. O.—Plankton of Loch Kir- 
bister. S.—Plankton of Loch Asta, 
F. constrwens (Ehrenb.), Grun, var. binodis, Grun. S,—Near 
Scalloway, 
Genus SYNEDRA, Ehrenb. 
8S. Ulna (Nitzsch), Ehrenb. 0O.—Finstown; Hoy. S.—Near 
Lerwick. 
S. pulchella, Kiitz. O.—Near Kirkwall ; Stromness. Plankton of 
Loch Kirbister. S.—Near Lerwick. Plankton of Loch Sandy. 
S. Vaucheriw, Kiitz. S.—Near Lerwick. 
S. radians (Kiitz.), Grun. O.—Moor pool near Stromness ; Hoy. 
S.—Neugles Water ; near outlet of Loch Beosetter, Bressay. 
Genus ASTERIONELLA, Hass. 
A. formosa, Hass. S.—Near Lerwick. Plankton of Neugles 
Water, Lochs Asta, Brindister, Trebister and Sandy, and also of 
Loch Beosetter, Bressay. 
TRANS, BOT. SOC, EDIN. VOL, XXIII. 3 
