271 
durch schwache Shattenlinien, welclie stets in dem Augen- 
blicke, wo man sie scharfer ins Auge fassen will, wieder 
verschwinden.” This outer region often possesses no very 
definite outline or contour; it frequently presents, however, 
a number of marginal triangular, irregular, changeable pro- 
jections, the ‘tongue-shaped’ processes of Focke, and 
which I have endeavoured to depict ; and at other times 
these disappear, when the contour becomes altogether in- 
definite and its substance (indefinable. These tongue-shaped 
processes seem quite comparable to the long triangular eleva- 
tions in the outer region of Rapliidiophrys, which bear up the 
spicules in somewhat longitudinally arranged clusters ; but 
in this form, as in the previous, this portion of the structure 
encloses no spicules. 
This species occasionally presents itself cohering into more 
or less definite groups of a few individuals by union of the 
pseudopodia ; or a few of the inner globes, as is the rule in 
Rapliidiophrys, are surrounded by the common outer invest- 
ing stratum. It possesses a considerable power of change of 
place. 
In one of his figures Focke points to the appearance or 
indication of a contractile vacuole, 1 but he does not seem to 
be satisfied as to its actual occurrence. In several specimens 
which I have met with, one or two, or even three, marginal 
pulsating vacuoles were present, and I watched their dilata- 
tion and contraction, which process is like those of an 
Actinophrys (PI. XVI, fig. 3). This circumstance, which 
has never shown itself in IT. mijriopoda, is one which, so far 
as it goes, brings this form closest to Actinophrys. 
In the following part of this paper I hope to speak of the 
relationships of these forms, as well as of the new genus 
Pompholyxophrys (PI. XVI, figs. 4, 5), which I am obliged 
to postpone for the present ; and I hope likewise to add 
some account, with figures, of some other new or little 
known Rhizopoda of Gromian affinities. 
(To be continued .) 
1 L. c., t. xsv, 1 g. 
