Fig. 
6. 
PLATE LXI. 
Fig. 1. ACTINOMETRA PULCHELLA, Pourtaleés, sp. 
. Vertical longitudinal section of an isolated disk. The section 
passes through the edge of the mouth, which is seen just 
in front of the large anal tube. The lobular structure in 
the centre of the lower part of the disk beneath the fore- 
gut is the plexiform gland, 
Figs. 2-5. AcTINOMETRA PARVICIRRA, Miill., sp. 
. Vertical longitudinal section of the calyx and disk. The situa- 
tion of the chambered organ between the centro-dorsal and 
radials is well shown ; as are also the marginal position of 
the mouth and the numerous coils of the digestive tube, 
from some of which the epithelial wall has fallen away. 
The labial plexus is relatively large in the upper lip (i.e., 
behind the mouth), but is inconspicuous in front of it, 
. Transverse section of an ungrooved or non-tentaculiferous arm, 
close to the base of a pinnule. ‘The ventral surface is 
flat, without any food-groove or tentacular apparatus, and 
owing to the backward extensions of the ovaries below 
their points of attachment to the genital cord, one appears 
in section upon each side of the middle line (p. 110), 
. The upper part of a transverse section of a normal tentaculi- 
ferous arm at the articulation of two joints, showing the 
connection of the ovary and genital cord. In the coeliac 
canal is a section of a parasitic worm, 
. Transverse section of the lower part of an arm just beyond the 
attachment of a pinnule. On the left side are seen three 
funnel-shaped water-pores, the inner ends of which lead 
into the genital canal containing the triradiate genital 
cord, 
Fig. 6. ACTINOMETRA NIGRA, r. sp. 
‘Transverse section of an arm through the middle of a joint, 
showing the branches of its axial cord. The genital canal 
is occupied by a relatively large genital cord, and the 
racial blood-vessel is well shown beneath the middle line 
of the food-groove, between the ambulacral epithelium 
and the water-vessel, 
_ Diam. 
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