18 
107. L 
108. 
109. 
110. 
Tillis 
112. 
113. 
114. 
115. 
TRANSACTIONS AND PROCEEDINGS OF THE [Suss. .xrx.. 
Var. cellulis paullo minoribus ‘quam in-forma typica, lobis- 
lateralibus fere quadratioribus, marginibus exterioribus levissime 
retusis ; collo lobi polaris latiori et breviori ; apice lobi polaris 
convexiori et retusiori in medio, angulis apicalibus rotundioribus ; 
tumoribus partis inferioris semicellule et lobi polaris multe 
reductis (ut in vertice visis), 
Long. 51-63 ; lat. 36-42u ; lat. lobi polar. 24-28, ; lat. isthm, 
10-11 °5u ; crass. 21—26y. 
S.—Scalloway ; Neugles Water. Plankton of Loch Beosetter, 
Bressay. 
This variety is widely distributed all over the British Islands,, 
and is more commonly met with than the type. Itstands near 
to EL. pectinatum, forma intermedia, Boldt (in “ Bih. till K. Sv. 
Vet.-Akad. Handl.,” xiii., No. 5, 1888, p. 6, t. 1, f. 3), but im the 
latter the polar lobe is very small, and its lateral margins almost. 
vertical. Boldt does not state whether the protuberances are 
reduced in his form or not, whereas this is one of the principal 
features of var. inevolutwm. 
In the vertical view the angles of the polar lobe and the 
lateral lobules of var. inevolutum are broadly truncate or 
truncate-emarginate, scarcely bilobulate as in the type. 
7, gemmatum, Bréb. S,—Bressay, in pools, and also in the plankton 
of Loch Beosetter. 
E. verrucosum, Ehrenb, S.—Bressay. 
Var. reductum, Nordst. S.—Plankton of Neugles Water and: 
of Loch Beosetter, Bressay. 
Genus MICRASTERIAS, Ag. 
M. truncata (Corda), Bréb. O.—Hoy. S.—Near Lerwick. 
M. papillifera, Bréb. O.—Kirkwall; Hoy. S,—Plankton of Loch 
Beosetter, Bressay. 
M. sol., Ehrenb. (M. radiosa, Ralfs.) S.—Plankton of Loch Beosetter,. 
Bressay. 
M. hottie (Grey.), Ralfs. $.—Near Lerwick. 
M., denticulata, Bréb. S.—Near Scalloway. Plankton of Loch. 
Beosetter, Bressay. 
Genus CosMARIUM, Corda. 
C. Ralfsii, Bréb, O.—Hoy. 
C. Cucumis, Corda, O.—Kirkwall; Hoy, §.—Scalloway ; Ler- 
wick ; Bressay. 
Var, magnum, Racib.[C. Cucumis 5, magna Racib., in “ Pamiet- 
nik Wydz. matem.-przy. Akad. Umiej. Krakow.,” x.,1885, p. 70; 
C, Cucumis, “forma major non tam profunde constricta quam 
anglica, membrana crassa,” Nordst, in “ Ofvers, af K. Vet.-Akad. 
Forh.,” 1875, No. 6, p. 29, t. 8, f. 28.] 
Long. 98u ; lat. 53u; lat. isthm. 33u ; crass. 38°5u. 
O.—W. of Kirkwall. 
. OC. subtumidum, Nordst. O.—Stromness ; Hoy, 
J, Subcucumis, Schmidle, O.—Hoy. 
. C. celatwm, Ralfs. S.—Lerwick,. 
. C. subcrenatum, Hantzsch. 0.—Hoy. S.—Plankton of Loch Asta.. 
. OC. Phaseolus, Bréb. 0O.—Finstown. S.—Plankton of Loch 
Beosetter, Bressay. 
' ventforme (Ralfs), Arch. O,—Finstown; Hoy. §S.—Sealloway ;, 
iG) 
