APPENDIX. hi 
PLATES VIII, [X., awn X. 
ILLUSTRATE 
MR. W. ARCHER’S PAPER ON FRESHWATER RHIZOPODA 
(p. 231.) 
DESCRIPTION OF PLATE IX. 
Fig. 
1, Acanthocystis Pertyana (sp. nov.). A few of the acute radiating spines shown 
thrown off. 
2. Raphidiophrys viridis (gen. et sp. nov.). 
It will be understood, in reference to this figure (as well as the other figures on 
this and succeeding Plate), that the object is drawn as seen when focussed down 
to the equatorial margin being brought distinctly to view, and that, of course, 
the outer investing stratum, here bearing spicules innumerable, is really interposed 
between the globular central bodies and the observer; but, being sufficiently 
transparent, this intervening stratum allows the central bodies to be seen through 
it. Ifit were possible, the pseudopodia should be rendered by a delicate, pellucid, 
almost silvery line, not by a black one; but this cannot be avoided. 
. Heterophrys Fockii (gen. et sp. nov.). 
To this figure the same remark applies. The marginal pulsating vacuoles are 
seen at the highest point of distention. The drawing attempts to indicate the 
appearance often presented by the ‘‘ tongue-shaped” processes projected from the 
margin of the outer stratum; but not unfrequently there is no definite outline, 
when it becomes difficult to discern where this region terminates. 
4, Pompholyxophrys punicea (gen. et sp. nov.). 
The outer vesicles, of course, cover the whole of the external surface of the 
reddish body, though seen only at the margin, being, as before, focussed down. 
The body contains a minute captured Cymbella. The figure hardly represents the 
reddish granules sufficiently individualized ; the contents are not so homogeneous- 
looking. 
5. The same, submitted to pressure, some of the pigment-granules crushed out, and 
some of the outer vesicles scattered. 
All the figures x 400. 
iv) 
