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176 ZYGOPHYCEÆ.
Stauzastzum S eb a ld i. PeinscTi. Algenfiora, p. 175, f. x i . , f . 1.
Semi-cells in front view truncately obconic, exterior angles
gradually narrowed, and a little produced into shortly truncate
3-4 dentate arms, dorsal margin convex, lateral margins and
dorsal margin downwards to half the segment armed with
spines, lateral arms marked with parallel transverse series of
warts ; end view triangular, sides angularly concave, narrowed
into the short, truncate 3-dentate arms, which are rough with
warts in parallel lines, on and within the sides two parallel rows
of spines.
Siz e, Length 76 p ; diam. 69-76 p (Re.); diam. 75-95 p
(Wo.).
Lundell Desm. Suec. (1871), p. 68.
var./3 oznatum . Nordstedt Norges. Desm. (1873), p. 33, fig. 15.
Arms more slender and elongated.
Siz e. Length 81 p ; diam. (with arms) 132 p (N.).
Wolle Desm. U.S. (1884), p. 138, t. 46, f. 1-6, 10.
H ab. In pools.
North Wales, Ireland ; Germany, Sweden, Norway, United
States.
Plate L X I ., fig. 1. a, living frond; I empty frond; c d, end
S tauzastzum a n a tin um . Clce. Wills Grevillea (1880), ix., p. 92,
t. 139, / . 6.
Large, granularly rough or spinous ; semi-cells iu front view
oval, with ends drawn out into diverging arms, apices trifid ;
end view triangular, sides slightly concave, with angles produced
into straight arms ; margins in both views ornate with large,
emarginate bifid, or papillæform warts.
Size. Length 30-40 p \ diam. 60-80 p (W.) ; length 50 p \
diam., including arms, 100 p \ isthmus 20 p \ length of arms
25 p (0 . & W.).
Cooke in Journ. Quekett Micr. Club (1880), vi., t. 15, f.
12, 13. Wolle Desm. U.S. (1884), p. 139, t. 51, f. 1, 2.
H a b . In mountain pools.
North Wales ; United States.
Plate L X I ., fig 2. a, living frond ; h, empty frond ; e d, end
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DESMIDIEÆ. 177
X. Segments in front view with the opposite lateral extremities
terminating in one or two elongate colourless
processes mostly divided at the apex, and in end view
either tapering into a simple process at each angle, and
furnished Avith others between or above of a similar
character, definite in number, or the angles furnished
with two short processes, side by side, and unaccompanied
by others.
t Segments at end view with the additional processes, more than
one for each angle, and placed on the margin, or upper surface,
and diverging laterally.
Stauzastzum eu step h a n um . {L h r ) Palfs. Lesm. (1848), p. 215.
Of nearly equal length and breadth, granular, margins more
or less serrate, semi-cells elliptic, with angles produced, furcate;
end view triangular, furnished with nine processes, counting the
three somewhat produced and bifurcate angles, the other six
on the upper surface, attached, usually, between the centre and
the margins, ends elevated above the surface, the processes
extend to margins, or slightly over th em ; in front view, these
present themselves on the outer margin in two pairs ; the third
pair is either under the cell, or stands towards the eye, and is
invisible.
Siz e . Diam. 50-75 p (Wo.).
Rabb. Alg. Enr-. iii. (1868), p. 220. Mask. New Zeal.
Desm. (1832), p. 244, f. 11. Wolle Desm. U.S. (1884), p.
147, t. 48, f. 9-11.
Staurastrum pseudofarcigerum, Cooke in Journ. Quekett Micr.
Club (1880), vi., p. 210, t. 14, f. 1-3.
Desmidium eustephanum, Ehr. Yerbr. (1843), p. 124, t. iv.,
f. 23 ?
Stephanoxanthium eustejihanum, Kutz. Spec. (1849), p. 184.
H ab . In pools.
North Wales ; Germany, New Zealand, United States.
Plate L X I I ., fig. 2. a, living frond ; I empty frond •, c d e, end
views.
t t Segments with the additional processes, one for each angle,
and placed on the upper surface immediately above those terminating
the angles.
Stauzastzum v e z tic illa tum . Archer in Micr. Journ. (1869), p. 196.
The largest of the rayed or armed forms yet found in Europe.
Ten radiating arms, which are beautifully toothed or serrated,
and notched at the end, extend in the end view like a wheel.
12
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