NOTES ON FRESHWATER ALG V7 
This species appears to be not uncommon in some parts of the 
British Islands. The filaments are very narrow, and the cells very 
he cell-walls are somewhat thin, but they break up in 
precisely the same manner as in other species of the genus. The 
extremely thin, of a pale yellow-green colour, and possess very 
irregular margins. Pyrenoids are absent. The terminal cell of a 
filament is sometimes produced out into an exceedingly fine hair- 
like point. We have also met with this plant in Yorkshire and the 
Lake District, usually in fairly pure masses in peaty pools, 
79. C. obsoleta, sp.n. (Pl. 446, figs. 18-21.) C. in ceespiti- 
bus densis, flavo-viridibus; cellulis robustis, diametro 1-1}-plo 
ellipticis, parietalibus, numerosis, sine pyrenoidibus; membrana 
cellularum firma. Crass. fil. 19-21 »; diam. aplanospor. 16 p. 
Hab. Near Penzance, Cornwall; St. Mary’s, Scilly Islands. 
This plant is of the same size as Microspora amena, and th 
cells are of the same proportions. The parietal chromatophores 
are very small and numerous, and are closely fitted all over the 
interior of the cell-wall. There is a globular nucleus situated in 
the protoplasmic lining of the cell, which readily stains with alum- 
carmine or hematoxylin. The filaments frequently form aplano- 
80. Bumilleria pumila, sp. n. (Pl. 446, figs, 22,28.) Cellule 
parve, subquadrate vel oblongo-quadrate, filum simplicem in 
vagina mucosa inclusum formantes ; chromatophoris parvis disci- 
formibus parietalibus 8-10, pyrenoidibus carentibus. Di 
4°8-5°7 w; long. cell. 5-6 p. 
Hab. Near Senens, Cornwall. 
is is a much smaller species than Bumilleria sicula Borzi 
(Studi Algologici, ii. Palermo, 1895, p. 186, t. xvi. et xvii.). e 
cells are also more quadrate and less closely connected together, 
the latter feature being due to the presence of a considerable enve- 
loping mucus. The chromatophores are smaller and more numerous 
than in B, sicula, but their parietal disposition is precisely similar, 
and they are destitute of pyrenoids. The cell-walls are extremely 
delicate. The alga was observed in considerable abundance, an 
it is the first recorded instance of the occurrence of the genus in 
Britain. 
81. Cuaractorsis minuta (A. Br.) Borzi. Characium minuta A. Br. 
Long. cell. 17-18 p»; lat. cell. 5°5 p. — oo 
Hab. Near Penzance, Cornwall. ge 
82. C. turgida, sp.n. Cellulis vegetativis ovato-ellipsoideis oe 
vel oblongo-ellipsoideis, apicibus acuminatis vel a 
