JOURNAL OF MICROSCOPICAL SCIENCE. 
EXPLANATION OF PLATE V, 
Illustrating Mr. F. O. Bower^s Memoir on the Develop- 
ment of the Conceptacle in the Fucacese. 
The following system of lettering has been used throughout — Initial 
cell = i. Basal oell = b. Lim iting tissue = 1. Cortical tissue = c. 
Central column =cc. Mucilage ^ m. Antheridial cell = a. Pedicel 
cell —p. 
The first six figires are all from material treated first with dilute chromic 
acid. The remaiung figures are from material preserved first in saturated 
solution of commoi salt (cf. text). 
Fucus serratus. 
Pig. 1 (^^).— Part of a vertical longitudinal section passing through 
the lip which surnunds the depressed apex of a fertile branch. The initial 
cell has ceased t( divide, and is surpassed by the surrounding tissue, a 
slight inclination i observable in the walls dividing the cells of the limiting 
tissue. 
Fig. 2 Part of a similar section, with an older conceptacle. The 
initial cell has bejun to shrink. The basal cell has not yet divided. The 
inclination ot thewalls of the limiting tissue is more pronounced than in 
fig.]. 
Fig. 3 (^^).— A young conceptacle as seen from above, the protoplasm 
of the initial celhas shrunk, and its cell-walls swollen. 
Fig. 4 Taken from a section similar to 1 and 2. This shows 
the initial cell nore shrunk, the basal cell divided loirgitudinally. The 
alteration of the>w'ollen cell-wall filling the cavity has begun. 
Fig. 5 (-^-^^^J-Part of a transverse section, with a conceptacle more ad- 
vanced ; it is (iifcult here to tell the limit between the part of the lining 
tissue, derived fpm the limiting, and that derived from the cortical tissue. 
Fig. 6 ^pg^t of a transverse section, with an older conceptacle, 
the central colum still attached. No formation of hairs as yet. 
Fig. 7 (i|-).-Male conceptacle. Mucilage showing stratification and 
striation. 
Fig. 8 i, ii, i (- *^).‘ — Antheridia in various stages of development 
from a single ce of the lining tissue. 
Halidrys siliquosa. 
Fig. 9. — Ve;ical longitudinal section, with conceptacle. 
liymantlialia lorea. 
Fig. 10. — ])ung conceptacle seen obliquely from above, showing initial 
hair protrudin from the cavity. 
Fig. 11. — lightly older conceptacle in longitudinal section. Initial cell 
shrivelled, u = Cuticularised outer layer of swollen covering of the 
limiting tissu (cf. text, footnote). 
Fig. 12 (J^). --Branching antheridial hair, sliowing transition, on for- 
mation of aiueridia, from monopodial to sympodial system of branching. 
The branchcare numbered according to their ages, ] being the oldest. 
