Nov. 
1904. | BOTANICAL SOCIETY OF EDINBURGH. 21 
The specimens were not exactly like the figure given by 
Wittrock (in “ Bihang till K. Vet.-Akad. Handl.,” Bd. 1, No. 1, 
1872, t. 4, f. 13), the central protuberance being somewhat larger 
and more granulated. 
. CL subcostatum, Nordst. O.—Plankton of Loch Kirbister. S,— 
Lerwick ; Neugles Water ; Loch Brindister. Plankton of Loch 
Clickhimin. 
5. C.costatum, Nordst. Long. 40u ; lat. 35y ; lat. apic.2 Ou ; lat. isthm. 
14:54. S.—Bressay. 
C. formosulum, Hoff. O.— Kirkwall; Hoy. S. — Bressay. 
Plankton of Neugles Water, and of Loch Asta and Clickhimin. 
. C. variolatum, Lund. O.—Hoy. 
. C. pyramidatum, Bréb. O.—Kirkwall; Hoy. S.—Scalloway. 
Plankton of Loch Beosetter, Bressay. 
. CO. Nymanmanum, Grun. O.—Hoy. 
. OC. granatum, Bréb. O—Kirkwall; Hoy. S.—Scalloway. 
Var. subgranatum, Nordst. O.—Plankton of Loch Kirbister. 
S.—Plankton of Loch Asta. 
. C. Holmiense, Lund. S.—Neugles Water. 
. C. tetragonum, Nag, var. Lundellii, Cooke. S.—Bressay, in a ditch. 
. C. notabile, Bréb. O.—Hoy. S.—Scalloway ; Bressay. 
. C. venustwm (Bréb.), Arch. O.—Stromness; Hoy. $.—Scalloway. 
Var. majus, Wittr. S.—Scalloway. 
. CO. tetraophthalmum, Bréb. O.—Finstown ; Hoy. S.—Scalloway. 
Plankton of Loch Asta, and also of Loch Beosetter, Bressay. 
156. C. Botrytis (Bory), Menegh. O.—Kirkwall; Stromness; Hoy. 
Plankton of Loch Kirbister. S.—Lerwick; Neugles Water. 
Plankton of Lochs Asta, Brindister, and Clickhimin. Bressay, in 
pools, and also in the plankton of Loch Beosetter. 
Var. tumidum, Wolle. S.—Plankton of Loch Asta. 
Long. 79u ; lat. 62u ; lat. isthm. 17m. 
157. C. obtusatwm, Schmidle, in “Engler’s Botan. Jahrbiich,” 1898, Bd. xxvi., 
158. 
159. 
160. 
p- 38. [C. wndulatum, var. obtusatwm, Schmidle, in “ Berichte 
Deutsch. Botan Gesellsch.,” Bd. xi., 1893, p. 550, t. 28, f. 11.] 
The specimens possessed rather smaller apices than those 
described by Schmidle. Long. 58-60u ; lat. 49-50z ; lat. isthm. 
15°5u. S.—Plankton of Loch Asta. 
C. ochthodes, Nordst. O.—Near Kirkwall ; Stromness; Hoy. S.— 
Lerwick ; Loch Brindister ; Bressay. 
Var. amebum, West. O.—Kirkwall; Hoy. S.—Near Scal- 
loway ; Bressay. 
C. margaritatum (Lund), Roy and Biss. O.—Hoy ; S.—Scalloway. 
C. Pseudobroomei, Wolle, “ Desm. U.S.,” 1884, p. 86, t. 51, f. 36, 37. 
Var. convexum, var. n. (fig. 22). 
Var. marginibus lateralibus semicellularum convexis, angulis 
rotundatioribus ; granulis ut in forma typica dispositis. 
Long, 46u ; lat. 37°5u ; lat. isthm. 12°54 ; crass, 24u. 
S.—Near Lerwick. 
This variety differs from all other forms of C. Psewdobroomet in 
the convex lateral margins and in the more rounded angles of the 
semi-cells. 
We have given figures of forms of CO. Pseudobroomet from 
Ceylon (vide “Trans. Linn. Soc.,” bot. ser. 2, vi., 1902, t. 21, 
f. 4); Schmidle has also given figures of a German Cosmarivwm 
which he names “ (, Pseudobroomez ” (vide “ Ber. der. Naturf. Ges. 
Freiburg,” Bd. vii., 1898, t. 5, f. 2, 3), but the granulation he 
indicates is much too fine for this species. 
