Rhabdamceba marina, gen. n. et sp. n. 221 
specimens a food vacuole can be seen containing probably small vegetable 
cells (Figs. 1 and 3), showing that nutrition is holozoic, but the method of 
feeding was not observed. The most noticeable characteristic of the animal 
is that the pseudopodia, of which there are usually about six, are prominent 
knoblike structures which contain generally four or five pointed rod- 
like bodies, and these project slightly from the surface of the pseudopodia 
like tiny spines (Figs. 1-6). Their function, unfortunately, has not been 
ascertained, and no dividing forms or stages of nuclear division could be 
found. One individual only showed what may be a contractile vacuole as 
a clear spherical area (Fig. 4). 
te 
Rhabdameba maria, gen. n, et sp. n. 
Judging from the various forms found, some of which are shown in the 
six figures, the organism must be fairly motile, and this description taken 
in conjunction with the figures contains all that can be stated at present 
concerning this puzzling form. It may, of course, be a developmental form 
of some already described organism, but its extemely small size and its 
peculiar structure render it unlike anything known to me in the Rhizopoda, 
to which group, judging from its general structure and its vesicular nucleus, 
it obviously belongs. 
All the fignres were drawn with the camera lucida. The magnification 
of the figures as reproduced is x 2250 diameters. 
(Issued separately, 6th May 1921.) 
