AROBERINA BOLTONI. 
73 
The uncoloured protoplasm is relatively small in amount and is not seen, 
owing probably to its forming in part a thin coating to the chlorophyll-cor- 
puscles, and being in part accumulated between and beneath those bodies. 
Fig. 16. — Archerina of same size as Fig. 7, but with irregularly-shaped 
chlorophyll-corpuscle, and with protoplasm gathered partly into an amoeboid 
lobe and partly into one long filament. 
Fig. 17. — A specimen of same size, showing few but large filamentous 
pseudopodia, and with a chlorophyll-corpuscle sharply cleft into two. 
Fig. 18. — Skeletal or “ghost” colony of Archerina. The spheres and 
filaments marked h are merely empty cases of great tenuity. Four chlorophyll- 
corpuscles are present and lobose protoplasm g. Diameter of each sphere = 
4 ^ooth of an inch. 
Fig. 19. — Colony consisting of two spherical chlorophyll-corpuscles sur- 
rounded by radiant and, g, lobose protoplasm. 
Fig. 20. — Irregularly-grouped chlorophyll-corpuscles and protoplasm, re- 
sulting from tetraschistic division of an originally single chlorophyll-corpuscle, 
such as that seen in Fig. 12 or 16. The abundant amoeboid protoplasm g is 
actively ingesting a bacillus-filament i. 
Fig. 21. — Tetraschistic colony of Archerina consisting of four groups of 
four chlorophyll-corpuscles, each invested with radiating filamentous proto- 
plasm. The regular symmetrical grouping of the products of division is 
striking, though not unusual in this organism. 
Fig. 22. — A similarly symmetrical colony, consisting of four groups of eight 
chlorophyll-corpuscles. 
Fig 23. — Small colony, in which the division of the chlorophyll-coloured 
spheres has not proceeded symmetrically, the product being one large and 
three small spheres. This is a very exceptional condition. 
Fig. 24. — Large vegetative growth of Archerina, consisting of some hun- 
dreds of chlorophyll-corpuscles and amoeboid protoplasm, g, giving off fila- 
mentous radiant pseudopodia at many points. Bacilli, ii, are being ingested 
by a portion of the protoplasm. The chlorophyll-corpuscles are arranged 
more or less obviously in groups of eight or sixteen, the arrangement resulting 
from their method of multiplication. They are of two sizes, the larger measuring 
g^jth of an inch in diameter, the smaller ones, k, less. The larger are seen 
in many places to be in course of breaking up to form the smaller by tetra- 
scbistic division. 
Fig. 25. — One of the larger chlorophyll-corpuscles of the specimen drawn 
in Fig. 24, after removal of the chlorophyll by alcohol and subsequent staining 
with picro-carmine. The fission lines of tetraschistic division are seen. 
Fig. 26. — One of the smaller chlorophyll-corpuscles of the same specimen 
similarly treated. 
