OXNERELLA MARITJMA. 
515 
On Oxnerella maritima, nov. gen., nov. spec., 
a New Heliozoon, and Its Method of Division; 
with Some Remarks on the Centroplast of 
the Heliozoa. 
By 
Clifford Dobell, 
Imperial College of Science, London, S.W. 
With Plate 27. 
In 1913 I found a minute and pretty heliozoon in some 
small tanks of sea-water in which I had been cultivating’ 
Foraminifera, Trichosphserium, and other marine Protozoa. 
For some weeks the organisms multiplied rapidly and became 
very abundant. I studied them alive as carefully as possible, 
and made a number of fixed and stained preparations in 
order to study their method of division in detail. I also 
made a number of notes and drawings at the time, but was 
too much occupied with other work to set them in order for 
publication. As the organisms seem not to have been de- 
scribed hitherto, and as their division presents certain 
features of interest, I now take the opportunity of putting my 
observations on record. 
1. General Description of the Organisms. 
Morphology. — The living organisms are typical sun- 
animalcules of very small size. They are almost spherical, 
with numerous filamentar pseudopodia radiating in all direc- 
tions (see PI. 27, fig. 1). The pseudopodia are so extremely 
fine that no internal structure can be made out in them, save 
