ARCHER—ON RHIZOPODA. 207 
foreign particles seem to be of very varied kinds (as in many Difflugic), 
such as diatomaceous frustules and fragments, arenaceous particles, 
protococcaceous cells (often seemingly living), brown peaty-looking 
particles, little indescribable shreds, all indistinguishably aggregated. 
From one end of this elliptic body the sarcode inner mass protrudes 
beyond this rude covering in an almost hemispherical or subconical 
form, and from this comparatively bare prominence emanate the fre- 
quently numerous and very variably long hyaline pseudopodia. I 
allude to this anterior prominence as only comparatively bare, for it 
often carries forward a few of the various external foreign bodies here 
and there disposed upon it, allowing the surface of the sarcode promi- 
nence to be seen between. The pseudopodia, as has been alluded to, are 
given off mostly very copiously, and radiate in any and every direction, 
and are more or less ramified, but do not seem to inosculate. A strik- 
ing peculiarity in habit of this Rhizopod, as presented by many of the 
specimens met with, is that when first placed upon the slide for exami- 
nation the pseudopodia are often seen to be prolonged to a very great 
and inordinate degree, and densely ramified at several points along 
their length (see fig. 6). At first glance, indeed, the tufts of what I 
might call secondary pseudopodia almost seem under a low power as if 
they did not even belong to the animal at all, but represented some 
other quite unconnected and independent Rhizopod. But upona more 
close examination it is seen that these tufts are really connected with 
the body of the creature by a direct continuation of the lower portion 
of a pseudopodium emanating from the anterior region. Shortly after 
being placed on the slide, however, these extravagantly long pseudo- 
podia are drawn in by a rather quick contraction, the tufts disappear, 
and all that now can be seen is a radiant and rather dense bundle of 
but shghtly ramified pseudopodia, of the same character as the accom- 
panying minor ones springing from the sides elsewhere, as seen in the 
example figured. And in this latter way the pseudopodia mostly pre- 
sented themselves in my specimens, because the very remarkably long 
drawn out and densely tufted form so speedily disappeared under ob- 
servation, and no amount of patience in waiting on them was ever 
rewarded by seeing them again so extended. 
At first glance it might be thought that we had here to do with 
another Gromia, but several characters seem at once to exclude our 
form from a place in that genus. First, the test is not membranous, 
but built (if so loosely and irregularly constructed a domicile can be 
said to be built) of foreign particles. Again, the pseudopodia, though 
they often copiously branch, do not seem to inosculate, nor carry a 
stream bearing along granules, but the pseudopodia are clear and sil- 
very in appearance. 
For so far, however, whilst our animal offers resemblances to 
several other allied forms, as well as distinctions from these, upon both 
of which I shall presently briefly touch, it presents still another 
characteristic (as I previously mentioned) which seems to be unique. 
I allude to the fact that from the whole of the surface of the inner 
