Novy. 
423. 
424, 
425. 
426. 
427. 
428. 
429, 
430. 
431. 
439. 
441, 
442. 
1904.] BOTANICAL SOCIETY OF EDINBURGH. 39 
Genus PHORMIDIUM, Kiitz). 
Ph. autwmnale (Ag.), Gom. O.—Kirkwall. S.—Scalloway. 
Ph, uncinatum (Ag.), Gom. O.—Near Stromness. 
Ph, laminosum (Ag.), Gom. S.—In ditches, Bressay. 
Ph, tenue (Menegh.), Gom. 0O.—W. of Kirkwall. S.—Lerwick. 
Genus OSCILLATORIA, Vauch. 
O. limosa, Ag. S.—Bressay. 
O. tenuis, Ag. O.—Finstown ; Hoy. S.—Plankton of Lochs Asta 
and Sandy, and also of Loch Beosetter, Bressay. Neugles Water. 
O. formosa, Bory. U.—Hoy, in stream. 
O. ornata, Kiitz. Crass. trich. 10u. S.—Near Scalloway. 
Family RIvULARIACE2. 
Genus CALOTHRIX, Ag. 
C. parietina, Thur. The specimens were somewhat narrower than 
usual. Crass. fil. 9°5-12u; crass. trich. 65-8u. O.—Near 
Kirkwall. S.—Near Scalloway. 
Order COCCOGONE. 
Family CHROCOCCACE. 
Genus MERISMOPEDIA, Meyen. 
. M. eruginea, Bréb, S.—Plankton of Loch Asta, Brindister, Click- 
himin and Trebister. 
. M. elegans, A. Br. S.—Plankton of Loch Brindister, and also of 
Loch Beosetter, Bressay. 
. M. glauca (Ehrenb.), Nag. O.—W. of Kirkwall ; Finstown ; Hoy. 
S.—Near Scalloway ; Neugles Water. Bressay, in ditches, and 
also in the plankton of Loch Beosetter. 
Genus CHLOSPHZRIUM, Nag. 
. CO. Kiitzingianum, Nig. S.—Near Lerwick ; Bressay. Plankton of 
Lochs Asta, Brindister and Neugles Water. 
. C. Ndgelianum, Unger. S.—Plankton of Loch Brindister. 
Genus MIcRocystTIs, Kiitz, 
M. elabens (Bréb.), Kiitz. S.—Plankton of Loch Beosetter, Bressay. 
. M. prasina (Wittr.), Lemm. S.—Plankton of Neugles Water, and 
of Loch Beosetter, Bressay. 
M. Flos-aque (Wittr.), Kirchn. S.—Plankton of Lochs Brindister 
and Clickhimin. 
. M. stagnalis, Lemm, S.—Plankton of Neugles Water and Loch 
Asta. 
Genus @Laocapsa, Kiitz. 
Gl. Ralfsiana (Hass.) Kiitz. S.—At the margins of Loch Beosetter, 
Bressay. 
Genus APHANOCAPSA, Nag. 
A, Grevillei (Hass.), Rabenh. O.—W. of Kirkwall. 
