282 The Botanical Gazette. (July, 
64 cells each (maximum estimate). Usually one or two of 
the gonidia fail to undergo division, and occasionally there 
are one or more cells in the reproductive area which do not 
even increase in size. 
In comparing this plant with others of similar type it is 
reasonable to suppose that there is a sexual generation yet to 
be observed.* If we consider that Gonitum, Pandorina, Eu- 
dorina, and Volvox represent a near approach to a true line 
of ascent, we have then in Pleodorina, so far as we can judge 
with no knowledge of its sexual generation, a new member of 
the series intermediate between the latter two, but much 
nearer to Eudorina. Its close affinity to Eudorina is indi- 
cated by the absence of any discernible protoplasmic connec- 
tion between the cells as well as by the mode of development 
of the individual from ciliated gonidia. It resembies Volvox 
more than Exdorina does in the number of cells composing 
the individual and the specialization of certain cells for the 
Purpose of reproduction. Thus we may expect in the sexual 
generation a degree of differentiation which shall be a step 
higher than that of Ludorina and nearer to the latter than to 
that of Volvox! 2 
With our present knowledge we may briefly describe the 
subject of these notes as follows: 
PLEODORINA, gen. nov.—Plant body a hollow, spherical or 
spheroidal ‘‘ccenobium” of green biciliate cells fixed i : 
hyaline gelatinous envelope. Red pigment spot in each cel. 
No connecting filaments between the cells. Non-sexual aa 
Production by gonidia; gonidia formed by increase in yes 
Part of the cells; daughters escape from mother plant : 
spheres of similar biciliate cells. Sexual reproduction 1? 
known. 
ts have 
5Up to date of present writing, April 7, 1894, no more of the plan 
been collected. 
