ON LIEBERKUHNIA WAGENERI. 143 
the changes in contour of the sarcode mass, and therefore 
not immediately apparent in the living animal, but is occa- 
sionally exhibited very plainly by the contraction of the 
sarcode within it (PI. XVI, fig. 8). The sarcode rotates con- 
stantly within this integument, and emits at the same time 
from a terminal orifice a main stem of protoplasm, from 
which the freely inosculating and branching pseudopodia 
principally arise. Pseudopodia are also numerously put 
forth by the coat of living sarcode which, spreading from the 
main aperture, completely invests the integument. No dis- 
tinct nucleus, such as that of Shephear della, can be detected 
in the body, but there are several clear spaces, as shown in 
fig. 8. These are very distinct, as they are carried along by 
the rotating protoplasm, and are persistent in form and size, 
partaking more of the nature of vacuoles than contractile 
vesicles. They do not appear to possess any wall, and are 
not seen in a mounted specimen. In addition to these 
vacuoles, a large number of vesicular nuclei” are dispersed 
throughout the sarcode, consisting apparently of a simple 
cell enclosing a clear fluid and one or more nucleoli. These 
are especially distinct in a specimen mounted in glycerine, 
a camera tracing of a portion of which is given on PI. XVI, 
fig. "Sy showing in optical section the integument with its 
spicula {a), the vesicular nuclei [b), the granular protoplasm 
(c), and the subcutaneous layer” {d). 
The vesicular nuclei” are apparently identical with the 
bodies so designated by Prof. Ray Lankester in his descrip- 
tion of the sarcode of Haliphysema Tumanowiczii} They are 
probably not quite so large in Lieherkuhnia, in which their 
average diameter is about of an inch (0*013 mm.), 
the size of those present in Haliphysema being about 
of an inch. They seem to be equally abundant in both 
cases, but there appears to be some difference in the manner 
of their distribution throughout the sarcode. Prof. Lan- 
kester having observed that those present in Haliphysema 
were “ scattered in the protoplasm, .... being most abun- 
dant in the basal portion of the core,” whereas in Lieher- 
kuhnia they are principally found resting on the outer surface 
of the internal protoplasm, just within the subcutaneous 
layer. I have not been able to detect as such any of the 
‘‘ egg-like bodies” of the same author, but as the only speci- 
men I at present have is mounted entire in glycerine jelly 
without previous treatment by reagents, they may possibly 
be there, although indistinguishable from the nuclei. 
This apparent identity of the structure of the sarcode of 
1 ‘ Quarterly Journal of Microscopical Science,’ October, 1879, 
