Nov. 
254, 
bo 
or 
Or 
256, 
257. 
265. 
1904.] BOTANICAL SOCIETY OF EDINBURGH. 29 
Ch. falcatum, Schroder, in “ Forschungsber. Biol. Stat. Plon,” vi, 
1898, p. 23, t. 1, f.5. Lat. cell. 4-524. §.—Scalloway. 
This species was frequently observed in the collections from 
Scalloway, and is remarkable for the great curvature of the cells. 
It has not previously been recorded from the British Islands. 
Family PLEUROCOCCACE&. 
Genus pLEUROCOCCUS, Menegh. 
. Pl. vulgaris, Menegh. 0. and S.—Very common everywhere. 
Genus UROCOCCUS, Kiitz. 
U. insignis (Hass), Kiitz. O.—Near Kirkwall ; Stromness ; Hoy. 
S.—Near Lerwick ; plankton of Loch Brindister ; Bressay. 
Family HypropicryAceé. 
Genus PEDIASTRUM, Meyen. 
P, Boryanum (Turp.), Menegh. 0,—Near Kirkwall; Finstown ; 
plankton of Loch Kirbister. S.—Near Lerwick, and at the 
margins of Neugles Water; Bressay, in ditches. Plankton of 
Neugles Water, Lochs Asta, Brindister and Clickhimin, and also 
of Loch Beosetter, Bressay. 
Var. granulatum (Kutz), A. Br.  O.—Plankton of Loch 
Kirbister. S.—Plankton of Lochs Asta and Clickhimin. 
. P. glanduliferum, Bennett. S.—Neugles Water ; plankton of Loch 
Beosetter, Bressay. 
. P. duplex, Meyen. O.—Plankton of Loch Kirbister. S.—Plankton 
of Lochs Asta, Brindister and Clckhimin, and also of Loch 
Beosetter, Bressay. 
. P. integrum, Nag. S.—Plankton of Loch Beosetter, Bressay. 
. P. tetras (Ehrenb.), Ralfs. O.—Finstown. S.—Near Scalloway ; 
Neugles Water ; Bressay. 
Family Prorococcacea® (or AUTOSPORACEA). 
Genus C@HLASTRUM, Nag. 
. O. sphericum, Nig. O-—Ward Hill, Hoy. §.—Plankton of Loch 
Asta, and also of Loch Beosetter, Bressay. 
. C. cambricum, Arch. [C. pulchrum, Schmidle.] | 0,—Finstown. 
S.—Neugles Water. 
. C. cubicum, Nig. S.—Neugles Water. 
Genus SORASTRUM, Kiitz. 
S. spinulosum, Nag. O.—Finstown. S,—Neugles Water. 
Genus CRUCIGENIA, Morren. 
. OC. rectangularis (Nag), Gay. O.—Finstown ; pond near Kirkwall. 
7. CU. wrregularis, Wille, “ Algologische Notizen IV.,” ‘*‘ Nyt Magazin for 
Naturvidenskb.,” Bd. 38, Heft 1, p. 10, t. 1, f.15. [Willea 
wrregularts, Schmidle, in “ Berichte Deutsch. Botan. Ges.,” 1900, 
Bd. xviil., p. 157.] 
Long. cell. 7-18» ; lat. cell. 4-94; diam. colon. 48-97u (figs. 
6 and 7). 
