156 Takeda . — Dysmorphococcus variobilis , gen. et sp. nov . 
whatsoever between these two organisms, except in so far as they both 
belong to the Volvocaceae. As a reinvestigation of Isococcus , in conjunction 
with Professor F. E. Fritsch, is in progress, further remarks upon this 
organism will be dealt with later in a separate paper. 
Diagnosis. 
Dysmorphococcus J Tak., gen. nov. Cellulae vegetativae nudae, libere 
natantes, polo apicale in rostrum brevissimum decoloratum producto et 
flagellis binis aequilongis quam corpore cellulae sesqui- vel subduplo lon- 
gioribus praedito, in tegumento rigido fragilique, brunneo, plerumque valde 
distento, aperturis binis instructo, nascentes. Chromatophora singula, 
viridis, urceolata ; stigma parvum, parietale ; nucleus fere centralis vel paulo 
anterior; vacuolae contractiles carentes(P). Propagatio ignota. Grege 
Coccomonadis collocandum esse videtur, sed a qua tamen membrana cellulae 
destituta aperturis flagellorum binis differt. Species unica. 
Dysmorphococcus variobilis , Tak., sp. nov. (Figs. 1-15). Cellulae pyri- 
formes, stigmate in parte media vel subanteriore, pyrenoide singulo basali 
vel submedio, subconspicuo ; tegumentum, brunneum vel atrobrunneum, 
granulis minutissimis regulariter distributis ornatum, valde polymorphum, 
a fronte visum rotundato-ovatum, raro subquadrangulare, rarissime irregu- 
lariter rhomboidale, a latere visum pentagonum, basin versus subcuneatum 
plus minus attenuatum, a vertice visum subovale, utraque aperturas flagel- 
lorum minutas, margine non incrassatas manifestans. Tegument, long. 
14-19 ju, lat. 13-17 crass. 10-14 /x. 
Hab. In stagno prope silvam Conduit Wood, in Richmond Park, 
Surrey (Oct., 1915) 
I take this opportunity of expressing my sincere thanks to Professor 
G. S. West, of Birmingham, for his helpful suggestions, and I also tender 
my thanks to Sir David Prain, C.M.G., the Director of the Royal Botanic 
Gardens, Kew, for allowing me to carry out the present investigation in the 
Jodrell Laboratory. I am also deeply indebted to Mr. L. A. Boodle, the 
Keeper of the Jodrell Laboratory, for his kindly criticism and valuable help. 
1 A berry of no particular shape is the derivational meaning of the word. 
