38 
DESMIDIUM, Agardh. 
Filaments 3-4, angular or compressed, regularly twisted, joints 
bidentate or bicrenate at the angles or lateral margins, an 
D. quadrangulatum, Ralfs. Cooke, lc., 11. Filament quad- 
rangular, varying in breadth from its twisting, haying two longitudinal 
waved lines ; joints in front view broader than long, with two some- ~ 
Prof. Moebius gives the following note :—‘‘ The cells completely 
agree in their shape with the typical form. (Compare the figure in 
so that they have only half the breadth assigned to them—namely, 
30 » broad and 3-3 as long. There were only isolated fragments of 
the filaments seen.” soa 
Fig 27: a, living cells; b, empty cells; c, transverse views — 
From ,Cooke’s British Desmids. : 
Hab.: Burpengary, Thos. L. Bancroft, Also found in Europe, North America, 
and Brazil. 
SPHEROZOSMA, Corda. 
globose or oval, smooth.—Cooke’s British Desmids. 
}. filiforme, (Zir.) Rabh. Cooke’s British Desmids. Joints aot 
as long as broad ; constriction acute ; segments elliptic, and united by 
double slender processes, which include a quadrate foramen between 
each pair. Size: Diam., 12-18 » (W.) ; 12-14» (K.). 
Fig. 26 bis.: a, living cells; b, c, empty cells.—Cooke, Le. 
Hab. : Still water, Thompson Estate, W. J. Byram. Also Ireland, Germany, 
and Sweden, : 
HYALOTHECA, Ebr. 
Filament cylindrical, very gelatinous ; joints having either align 
00 
ctagpants way de> produces a crenate appearance, or a gr 
one or bot d jecti 
vi circular ; endochrome radiate. Zygospores round, smoot™ 
Archer, in Priteh.; Cooke’s British Desm., 7. 
3 
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a 
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