36 ON PROTOPLASMIC CONTINUITY IN THE FLORIDES. 
The only other species in my possession are C. bysso oides and 
C. polyspermum, in both of which similar phenomena are to be met 
with. 
2. PotysreHonta. 
er ey from Callithamnion we may ote a nite in reference to 
aspects. The thallus consists of long delicate filaments of a deep | 
red colour, from which lateral branches, having similar characters,” 
arise sympodially. Examined eee every filament and 
every branch is found to : organised as follows :—In the centre of 
the filament is an axial row of cylindrical aan, placed end to end, 
which constitutes the “ seaiittal siphon’? of marine algologists. 
Completely aby ess this are four so-called “cortical siphons” 
running parallel with it, a a ed of similar cells, arrang' 
in a similar a ner. Thec of the ‘ cortical se agree have a 
somewhat greater diameter an those of the centre, but they are 
equal to them in length, and are so placed that their transverse 
partitions coincide with those of the axis. The filament may be 
said therefore to be articulated, er section being composed of a 
central ie enclosed by four cortical 
plate 248, fig. 4, which Bi eos a i boeGion of the nua mee seen in 
optical longitudinal section. At (a) is a ae of the central siphon, 
and at (6) ete cells of ey cortical sipho 
Th 
thread j is pe siiolkate in its composition, it ought to 
noted that it is often destitute of granules, 
xt point to be n oticed is that the protoplasm of the 
ociitral Sar is siiseesd by short lateral processes with the proto- 
plasm of the cortical cells. This is shown at (c). These processes 
are similar to those already described, and are generally situated 
