with round lacunas, whose borders are slightly thickened.
Fructification consisting of subglobose granules arranged
in fours. These arise from larger globose granules which
split into four, and gradually assume a subglobose or oval
form. In old plants the quaternary arrangement is no
longer visible, and the granules under a high power contain
about three minute globose bodies.
Though the plant was kept from May 13 to J une 10,1837,
I could never observe the slightest motion in any of the
granules at any time of their development. This, however,
may have arisen from the unusual coldness of the season.
During the present year the species has not occurred where
it was in profusion in 1837, and I must therefore refer to
the observations of M. Gaillon.
According toM. Desmazieres, Tetraspora lubrica Ag. Ic.
Alg. Eur. t. 15., to which I believe Moug. Sç Nest. n. 600.
is referable, is a distinct species, of which he has given
specimens, PI. Crypt, n. 654., under the name of Tetraspo-
rella cribrosa.—M. J . B.