H ab. In pools.
Ireland ; Sweden, Norway, Greenland.
Plate X L ; jig. 9. a, living frond ; I, empty frond ; c, end view ; d,
side view.
C o sm a z ium h e x a lo l)um . Nordst. Lesm. Spitz. (1872), p. 33, t. 7,
f. 16.
Somewhat hexagonal, about one-quarter longer than broad,
constriction linear, segments trapezoid, sides with about four
crenatures, slightly constricted beneath the apex, granules on a
basal nodular swelling in 4 to 6 vertical series, side view rectangular,
end view broadly elliptic, ventricose, and crenate in the
middle, everywhere granular.
Siz e . Length 45-50/u ; diam. 85-40 g.
Archer in Quart. Journ. Micr. Sci. (1879), xix., p. 441.
Wille Nov. Zem. (1879), p. 47. Nordst. Norges Desm.
(1873), p. 15. Nordst. Desm, Gronl. (1885), p. 9. Nordst.
Pesm. Arct. (1875), p. 27, p. 41.
H ab. In pools.
Ireland ; Norway, Greenland, Nova Zembla, Spitzbergen,
Eussian Lapland.
Plate X L ; fig. 10. a, living frond j I, empty frond; c, side view; d,
end view.
C o sm a z ium c y c lic um .
i . i'i|
Lundell Lesm.
6 , d.
e. (1871),g. 35, t. 3 , / .
Medium size, broader than long ; perfectly circular, deeply
constricted with a very narrow linear sinus; semi-cells semicircular,
margin crenate with 12 crenations, end view narrowly
elliptic, side view dilated upwards, with the apex somewhat
truncate ; cell membrane about the margin obsoletely granulate-
plicate, with the folds arranged in a regular concentric series.
Siz e . Length 49-52 p ; diam. 52-55 g (L ).
Archer Micr. Journ., xv. (1875), p. 412 ; xvii. (1877), p.
102. Nordstedt Norges Desm. (1873), p. 16. Nordstedt
Desm. Arct. (1875), p. 23, 88 (var.). Nordst, & Wittr.
Desm. Ital. (1876), p. 37. Wille Nov. Zem. (1879), p. 42.
Nordstedt Desm. Spitz. (1872), p. 31. Nordst. Desm. Gronl.
(1885), p. 7. Lemaire Desm. Vosg. (1883), p. 20.
Hab. In mountain pools and bogs.
Ireland, Lake District, Den of G ig h t; France, Sweden, Norway,
Greenland, Italy, Spitzbergen, Nova Zembla.
C o sm a z ium sp e c io s um . Lundell Lesm. Suec. (1871), p. 34, t. 3,
f.S .
Of medium size, length more than times the breadth,
elliptic-oblong, constricted, with a narrow linear sinus, semicells
gradually but slightly attenuated upwards, apex subtruncate,
sides very slightly convex, margin crenate, with about 18
crenations, granules arranged in a regular concentric series, with
7-8 vertical series of smaller, less distinct, granules at the base;
end view elliptic, delicately granulate at each pole ; side view
subovate, amylaceous granule single.
Siz e . Length 54-62 g ; diam. 39-41 g (L .) ; length 50-
75 g ; diam. 33-50 g (W o .).
Archer Micr. Journ., xiii. (1878), p. 101. Nordstedt Norges
Desm. (1873), p. 15. Nordstedt Desm. Arct. (1875), p. 22,
38 (var,). Nordst. & Wittr. Desm. Ital. (1876), p. 37. Wille
Nov. Zem. (1879), p. 41. Nordstedt Desm. Spitz. (1872), p.
30. Jacobsen Desm. Denm. (1874), p. 195. Maskell N.Zeal.
Desm. (1882), p. 240. Wille Norges Fers. (1880), p. 29.
Wittr. Sottv. Alg. (1872), p. 58. Lemaire Desm. Vosg.
(1883), p. 19. Wolle Desm. U.S. (1884), p. 87, t. 19, f. 7-9,
14, 15.
H ab. In pools.
Lake D istric t; Prance, Sweden, Norway, Italy, Denmark,
Spitzbergen, Nova Zembla, New Zealand, United States.
Plate X L I ., fig. 1, a, living frond; b, empty frond; c, side view
d, end view.
C o sm a z ium s u b s p e c io s um . Nordst. Lesm. Arct. (1875), p. 22,
t. VI.,/. 13.
Medium size, one-third or one-fourth part longer than broad,
elliptical-oblong, deeply constricted in the middle with a linear
sinus, expanded outwards, semi-cells semi-circular, gradually
narrowed upwards, apex faintly four-crenate, sub-truncate,
sides convex, 6-7 crenate, lower angles almost rectangular,
above the isthmus a tumor not much elevated, either sub-
circular or elliptic, with granules in 5 or 6 series, or irregularly
disposed; about the margin finely granulate, with radiating
granules concentrically disposed, the two inner series, and the
basal, single, the rest in pairs ; side view more or less ovate,
end view elliptic, apices broadly rounded, slightly swollen at the
middle.
Size. Length 41-48 g ; diam. 30-36 g ; isthmus 13-16 g
(N.).
Wille Norges Fers. (1880), p. 29. Wille Nova Sem. (1879)»
p. 41.
'i I