ALGOLOGICAL NOTES 77 
chloroplast did not extend, therefore, to either pole, but was very 
massive and occupied most of the rest of the cell. It was destitute 
of a pyrenoid, but contained numerous small starch-grains. The 
stigma was conspicuous, and either median in position or situated 
just behind the middle of the cell. 
The origin of the zoogonidia (daughter-cells) did not entirely 
correspond with Dangeard’s description. So far as could be 
judged in all the examples examined, four daughter-cells arose 
simultaneously by a tetrad division of the protoplast of the 
mother-cell (vide fig. 2,D and E). There was no preliminary 
transverse division. 
pyrenoide singulo ucle 
anteriori; stigma carente; partitione prima cellule matricalis 
peculiarly free from granules, reminding one of the chloroplasts 
in many species of Ulothrix. The clear colourless space behind 
the cilia was particularly deep, extending for fully one-third the 
length of the cell. There was also a very large clear space at the 
sent in any specimen observed; neither were any contractile 
vacuoles observed, although they may possibly have been present. 
The first division of the mother-cell is obliquely longitudinal (fig. 2, 
7. Chlamydomonas gracilis, sp. nov. Cellule vegetative 
(= zoogonidia) minute, elliptico-fusiformes, nonnunquam sub- 
curvatz, diametro circiter 4-plo longiores, polis rotundatis ; mem- 
brana firma sine verruca anteriori; chromatophora sin a cum 
Pyrenoide singulo parvo submediano; stigma carente ; partitione 
prima cellule matricalis longitudinali. 2 
a ae set 11:5-12-5 yp; lat. cell. 2-6-3»; long. ciliorum 12-16p. 
ig. 2, F-I. 
Hab. 1. a boggy spring, Sutton Park, Warwickshire. 
This species is readily distinguished by the small size and 
