Spencer.—On the Fresh-water Alge of New Zealand. 293 
fertilization seen in some normally wind- or insect-fertilized flowers at 
certain seasons. In fact, we find cleistogamous flowers in our subaqueous 
plants as well as in their aerial congeners. 
CE DOGONIACER. 
(Edogonium ciliatum (?), H., lii. 
»  compressum, H., liti. 
OscILLaTORIACEs. 
Bacterium, M. Die., p. 3. 
Vibrio rugula (?), M. Dic., p. 8. 
Spirillum volutans, M. Die., p. 3. 
Spirulina jenneri, M. Dic., p. 8. 
Oscillatoria autumnalis, H., xxii. 
- decantioniety i. , ixxi. 
er pS 
ry conteata (?), H., xxi. 
sp. n. (?) 
Misruleus gracilis, H., Ixx. 
Lyngbya muralis, H., lix. 
Calothrix. 
Polypothrix (?). 
Oscillatoria.—I have no doubt that with further pian Cink 
be indefinitely extended. The characters of some of the species are not 
very distinctly marked ; and I imagine their nomenclature is not yet set- 
tled. Certainly the dosiecaptiii and figure of O. autumnalis as given by 
Hassall are very different from those in the Micrographic Dictionary. The 
peculiar characteristic of this genus, from which its name is derived, is the 
Singular movements of the filaments. What the cause of these move- 
ments is has been the subject of some speculation, but has not been de- 
termined. No special organs of motion have been discovered. mngee 
they are vital or merely mechanical phenomena, is at t imp to 
decide, I have seen them in plants which had been immersed many days 
in Hantzsch’s fluid still continuing, feebly but quite perceptibly. The 
Movements are of two kinds—oseillatory and progressive. In the first, 
the filament, being apparently fixed at one end, sways backwards and for- 
"ards upon a centre like the pendulum of a clock, and it may either 
remain in a state of rigidity, or may curve with a flexibility resembling — 
tet of the long thin branch of e tree when agitated by the wind. ‘The 
other movement is on t A filament wi , after a period 
— en 
ste kay 
