AEOHEEINA BOLTONI. 
71 
ingestion of food particles, but in the later vegetative growth I 
often saw Bacteria and Bacilli in course of ingestion (figs. 20, 
24, i ). 
No contractile vacuole was observed in any phase. 
In the Actinophryd-phase only was a vacuole (and that a 
non-contractile one) observed. The protoplasm in the Actino- 
phryd-phase is free from granules, homogeneous and refrin- 
gent. In the vegetative stage it has a finely-flaky appearance. 
The pseudopodia were not altered in form by the action of 
dilute acids or of alcohol. 
Numerous observations were made as to the presence of 
amyloid substance in connection with the chlorophyll-cor- 
puscles. In small colonies I usually failed to obtain any violet 
coloration after removal of the chlorophyll by alcohol and 
subsequent addition of iodine solution. But in larger colonies 
I obtained decided violet staining of the protoplasm imme- 
diately surrounding the chlorophyll-corpuscles, for instance, in 
such colonies as that represented in fig. 24. 
6. Affinities of Archerina. — Archerina is clearly one of the 
non-nucleate Gymnomyxa (Homogenea or Monera), and is, in 
so far as regards the various forms which its protoplasm may 
assume, not far removed from Cienkowski’s Vampyrella. It 
is, however, definitely characterised and distinguished by its 
nucleus-like chlorophyll-corpuscle. No other Protozoon is 
known the form of which is thus dominated by a chlorophyll- 
corpuscle, nor is there any form with a chlorophyll-bearing 
nucleus which might be compared with it. In regard to 
nutrition it clearly gives evidence of both plant-like assimila- 
tion of carbon through the agency of its chlorophyll-corpuscles 
and of the usual ingestive voracity of the naked Protozoa. 
In respect of its abundant colony-formation, Archerina re- 
minds one of Microgromia socialise but it differs widely 
from that organism in having a chlorophyll-corpuscle in place 
of a nucleus, and in forming a complete membranous envelope 
extending over the pseudopodia instead of (as in Microgromia) 
a sac-like case with a mouth or orifice for exit. 
I shall not be surprised if some naturalists maintain that 
