204 CYSTIPHORE. 
Chroococcus coherens. Wag. fide Rabh. 
Cells oblong, twin, or in fours, with a distinct hyaline ellipsoid 
tegument; cell-membrane thin, achromatic; cell-contents 
homogenous, or slightly turbid, blue-green. 
P ey Cells -003--006 mm. diam. Families of 2-4 indiyi- 
uals. 
Rabh. Alg. Eur. ii, 30. Kirch, Alg. Schles. 261. 
Protococcus coherens, Kutz. Spec. 197. Tab. Phye. 1, t. 5. 
Pleurococcus coherens, Breb. in Meneg. Nost. Ital. 35, t. iv., 
On damp walls and flower pots. 
Plate LXXXIITI. fig. 1. Cells magnified 400 diam, 
Chroococcus turgidus. Nag. Hinz. Alg. p. 46, 
Cells spherical, oblong-ellipsoid, or more or less angular from 
compression, single, twin, ternate, or quaternate (rarely 8), 
associated in families, tegument thick, usually evidently lamel- 
lose, colourless. _Cell-membrane thin; cell contents bright 
verdigris green and homogenous, at length becoming brownish 
and granulated. 
Size. Cells -013--025 mm. diam. Families of 2-4, 
Rabh. Alg. Eur. ii., 32. Kirch. Alg. Schles. p. 262. 
Protococcus turgidus, Kutz. Tab. i., t. 6, f. 1. 
Hematococcus binalis, Hass. Alg. p. 381, t. 82, f. 2. 
In swampy places and on moist rocks. 
Not at all uncommon; often mixed with other alge. Easily dis- 
tinguished by its size. 
Plate LXXXTIII. fig. 2. Cells magnified 400 diam, 
GENUS 82. GLCEOCAPSA. Kutz. (1843.) 
Cells spherical, either single or numbers, associated in 
families, the single cell included in a vesiculiform tegument, 
this cell undergoing division into two daughter cells, Each 
has a distinct tegument, the whole being surrounded by the 
tegument of the mother cell. This process is repeated’ again 
and again, the original tegument remaining and surrounding 
the family thus formed. Cell membrane thick, often very thick, 
equalling or exceeding in diameter the cavity of the cell; 
colourless or coloured, mostly lamellated, strata not un- 
frequently separating. Cell contents of various colours, 
