106 LIVERPOOL BIOLOGICAL SOCIETY. 
flagellate antherozoids within the ccoenobe, very much in 
the same manner as in Fucus. Volvow is also propelled, 
like Pandorina and Eudorina, rapidly through the water 
by means of delicate flagels projecting through the gelati- 
nous coat of the coenobe; but these flagels belong to a 
peripheral layer of cells which have no power either of 
conjugation or of germination, affording the very unusual 
phenomenon of cells endowed with spontaneous motion, 
which have, nevertheless, as far as is known, no direct 
reproductive function. To this very remarkable phe- 
nomenon reference will again be made hereafter. 
That the antherozoids of the higher Cryptogams—and 
therefore the pollen-grains of Flowering Plants—are gene- 
tically descended from zoogametes, and these again from 
zoospores, we have further conclusive evidence in the 
various processes of reproduction in that interesting class 
of sea-weeds, the Phzeospores. In this class the swarm- 
cells are alike in their external appearance and motile 
properties, each being provided with two large and 
slender flagels, one of which is directed in front, the other 
dragged behind, in the swarming movement. They are, 
however, partly non-sexual zoospores, partly sexual zoo- 
gametes. The sporanges (or gametanges) of the Pheeosporez 
are of two kinds, unilocular and plurilocular, although 
intermediate conditions between the two occur. «The 
unilocular sporanges are comparatively large structures, 
usually pear-shaped, ovoid, or nearly spherical in form, the 
contents of which break up into a large number of zoo- 
spores, which escape through an apical or through a lateral 
opening. The multilocular sporanges are elongated bodies, 
having somewhat the appearance of jointed hairs, seg- 
mented usually in the transverse direction only, but 
sometimes in both. From each of the cells is produced a 
single zoospore ; when mature, either each of these escapes 
| 
| 
| 
| 
