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Fig. B. Pectinura infernalis, showing the disk and the variations of
the “ naked plates,” X 3.
C. Ophiopinax stellatus, showing the arrangement of the radial
and interradial plates on the disk, X 2.
P l a t e IX.
Fig. A. Cucumaria semperi.
B. Colochirus tuberculosus. Spicules seen from the side and
from below.
C. Actinocucumis difficilis.
D. Thyone oTceni. Calcareous ring and oesophagus.
E. a and h, spicules of Stereoderma va lid um; c, d, the same,
seen a little out of focus; e, a smaller spicule ; / , a spicule
seen in side view.
F. PhyUophorus proteus. F'. Parts of calcareous ring.
G. Holothuria macleari.
AU but figs. D and F' are magnified 220 times, and are figures of
spicules; D is magnified f , E' twice.
P l a t e X.
Pig. A. Antedon carpenteri, nat. size. A a. A h , A c , Eirst, second,
and typical pinnules, X 3.
B. pumila, X 3. B «, B Eirst and fourth pinnules,
x 3 .
C . loveni, nat. size. C a, C 5, C c. Eirst, third, and typical
pinnules, x 3. Gd,Ce. Dorsal surface of arms in regions
marked x and y mC, X 3.
P l a t e X I.
Fig. A. Antedon bidens, X 2. A a. A cirrus, X 4. A h , A c . First
and third pinnules, x 4.
B. — — decipiens, x f . B a. Arm-joints from above, x 4 .
P l a t e X II,
Fig. A. Antedon reginæ, nat. size. A a. Cirrus, X 3. The arms are
correctly figured as thirty-eight in number ; five in the text
is a misprint.
B. ------- X 2. B a. Cirrus, x 4. B 6. Second pinnule,
X 4 .
P l a t e X I I I .
Fig. A. Antedon irregularis, X 2, A a , A h , A c . Second, third, and
fourth pinnules, X 4.
B. elegans, X 2, Ba. Disk from below. [In the description
(p. 162) thirty arms instead of twenty have been
ascribed to this species by inadvertence.]
P l a t e XIV.
Antedon briareus, nat. size, a, h. Second and fourth pinnules,
x 4 .
P l a t e XV.
Antedon microdiscus, nat. size, a, disk from below ; h, second,
c, seventh pinnule, x 3 ; d, cirrus, x 2.
P l a t e XVI.
Fig. A a. Basal joints of the second pinnule of Actinometra Solaris,
X 6 .
A h . Basal joints of the second pinnule of Actinometra intermedia,
X 6 .
A c. Basal joints of the second pinnule of Actinometra rohusta,
X6.
B. Actinom tra coppingeri, x 3.
P l a t e X V II.
Fig. A. Actinometra paucicirra, X 2. a. First pinnule, x 4.
B . variabilis, nat. size. a. Second pinnule, x 4.
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