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EXPLANATION OF THE PLATES, 683<br />
Plate LIV*<br />
Fig. a. LeucaUis bathyhia, var. mascwetiica, the two forms of stout<br />
quadriradiate and the triradiate spicules of the main<br />
skeleton, x 38. a'. The minute tri- and quadrii'adiates<br />
of the cloacal surface, X 370. From type specimen from<br />
Seychclle Islands.<br />
h. Axinella spicidifera, two sizes of the skeleton- spicule, x 68,<br />
From specimen from Darros Island.<br />
c. A. 2:>roUferans, the skeleton-spicule, x 68, From typo<br />
specimen from Providence Island.<br />
d. Leucortis (imjuinea, the stout acerate, and different forms<br />
of the tri- and (luadriradiate spicules of the main ske-<br />
leton, x 68. d\ the slender acerate (?) of the peristome<br />
(the outer end imperfect), x 370. From type specimen<br />
from Providence Keef.<br />
e. Erylus cyUndrigerns. part of the disk-spicule, in profile, x 190.<br />
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