ALGOLOGICAL NOTES. 
89 
smaller than the quiescent spores of A. pusilla. He thinks, how- 
ever, that the largest specimens found on Padina belong actually 
to the latter species. In any case the bodies are about 10 p in 
diam., and they are arranged rather loosely (Fig. 7). They are 
still considerably larger than the zoogametes in Giffordia ( Ect .) 
Lebelii , which are about 7 p in diam., and the sporangium of the 
latter is quite crowded and turgid when mature. 
An older plant may consist of three or four filaments, up to 
2 or 3 m.m. (Fig. 5), arising from the base, and bearing sporangia 
(56), but an antheridium is rarely found (5a ') excepting at the 
base (5a). Still larger specimens possess only the sporangia, and 
have sometimes a few simple branches on the primary filaments. 
There can be no doubt as to the character of the bodies in the 
antheridium although not observed outside. As to the sporangia 
it is assumed that these contain ciliate gametes. It appears to me, 
however, taking into account the association with Acinetospora 
pusilla , that it is not impossible that this small plant may be the 
sexual form of A. pusilla with either ciliate or quiescent gametes, 
and that the form known so long to Dr. Bornet, and bearing 
plurilocular sporangia containing quiescent spores, may be the 
neutral state of the same species. Until this be proved or other- 
wise I may be permitted to propose the following characters : — 
Giffordia Padinae, sp. n. 
Erect filaments 1-3 m.m. high, 25 p diam., attenuated at base to 
17 p , simple or slightly branched : one or more arising from a 
short filamentous root inserted between the cells of the host. Cells 
of filaments about twice as long as wide. Antheridia ovate- 
lanceolate in outline, pedicellate, at the base of erect filaments, 
or rarely a few cells higher : up to 105 p long and 52 p wide ; 
antherozoids about 4 p in diam. Gametangia long-ovate, pedi- 
cellate or sessile,, at intervals on the erect filaments, occasionally 
at base : up to 130 p long and 55 p wide. Gametes about 10 p 
in diam. 
Hab. On Padina Pavonia Gaill. Sidmouth. August. 
Conjugation of zoogametes in Cladophoxa lanosa Kiltz. 
The aspect of this alga is rather striking when bearing gametes. 
The ordinary cells are very pale and delicate in appearance, and 
in length about twice the diam., whereas the fertile cells are very 
dark, only about as long as the diam., and form groups of four 
to a dozen or more near the middle of the principal filaments and 
the adjacent bases of branches (Fig. 8). 
Very early in their development the contents of the fertile cells 
have a slightly brownish tinge, and when mature they have 
become so brown that it is difficult to see any trace of green. The 
gametes, while still within the cell, move rather vivaciously for 
some time (Fig. 9a), and the whole of the cell contents then 
