CLIFFORD DOBELL. 
20 
pseudopodium. They may at times be seen to meet one 
another when coming from opposite directions, and, after 
appearing to jostle one another for a moment, travel away in 
opposite directions — sometimes returning along their former 
paths, sometimes passing one another. In such circumstances 
their movements appear curiously purposive, and they remind 
me of the equally remarkable movements of the spindle- 
shaped bodies (individual organisms ?) in the living network 
of a Labyrinthula . 
Oxnerella, like other Heliozoa, largely uses its pseudo- 
podia for capturing its food. In the aquaria this consisted 
almost entirely of the sw^arm-spores of green algae, which were 
plentiful. The living animals were generally filled with the 
bright green bodies of these (PL 27, fig. 1), in various stages 
of digestion, and under a low magnification themselves 
appeared to be green in consequence. 
The water in which Oxnerella occurred was sent to 
London from Plymouth. But it is quite likely that the 
organisms are widely distributed and by no means uncommon 
in the sea, and have hitherto escaped notice on account of 
their minute size. 
4. Division. 
My chief reason for describing Oxnerella is to enable me 
to record and figure in detail its method of multiplication b;y 
division. I shall therefore enter into this matter now with 
some particularity. 
The two organs whose behaviour is of special interest in 
division are the nucleus and the so-called “ central granule,” 
to which the axial fibres of the pseudopodia are attached. I 
shall therefore begin by describing these two structures in 
the “ resting ” (i. e. not dividing) organism in greater detail. 
The Nucleus. — On account of its somewhat large size 
and its lack of colour, the nucleus of Oxnerella can usually 
be made out quite clearly in the living organism. It lies 
embedded among the bright green food-bodies present in the 
