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BIBLIOGRAPHY. 
On Conchocelis, a new genus of perforating algce. E. A. 
Batters. — The special interest attaching to this alga consists in the 
fact that it is of a beautiful carmine colour, and apparently belongs 
to the Porphyracese, whereas the eight genera of perforating algae 
previously known belong either to the Cyanophyceae or the Chloro- 
phyceae. 
The alga is met with in empty shells of various species, and 
betrays its presence by a pink stain on the surface of the shell. 
“ Liquide de Pereny ” was found to be the best decalcifying agent. 
The alga, when removed from the matrix, is seen to consist of 
branched, interlacing, septate filaments, which, in young specimens, 
radiate from a central point. The filaments are of various widths 
and very irregular in the mode of branching, the lateral shoots 
sometimes anastomosing, and the whole forming a horizontal net- 
work running in the superficial layer of the shell. Below this 
layer the filaments produce here and there irregularly shaped, 
septate inflations that are much more robust than the ordinary 
cells. The centre of each of these inflated cells is occupied by a 
stellate chromatophore. These inflations often become detached 
from the parent plant, and are capable of an independent existence. 
The plant also appears to be reproduced by spores formed in the 
inflations, one spore in each cell. 
The form and colour of the chromatophores, also the mode of 
spore-formation, suggest a relationship with Erythrotrichia , from 
which, however, the present genus is sharply separated by the 
branched frond and peculiar inflations. 
LICHENS. 
The following new British lichen was described by G. Massee 
in the “ Journal of Botany,” July, 1892. 
Vexxuc&xia laetevixens, Mass. 
Thallus forming a broadly effused, rather thick, inseparable film, 
very smooth and even, not cracked, rather gelatinous, bright olive 
green, the lobed margin paler and yellowish ; gonidia protococcoid, 
globose, 12-15 p diam. ; perithecia minute, crowded, globose, 
entire, black, completely immersed in the thallus, ostiolum forming 
a very minute, slightly raised black ring ; asci clavate, spores 8, 
inordinate, 1-celled, elliptical, colourless, 11-12 x 6 p ; paraphyses 
scanty, slender, cylindrical ; spermagonia immersed, mixed with 
the apothecia, sterigmata filiform, simple, aseptate, spermatia 
cylindrical, straight, 8-9 x 2 p. 
Hab. On smooth rocks between tide-marks. Berwick-on- 
Tweed and Burnmouth, on the east coast; Loch Goil, Cumbrae, 
and Gare Loch, on the west. (E. A. Batters.) 
There are at least sixteen British marine Lichens included under 
the somewhat heterogeneous collection called Verrucaria. The 
