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672 EXPLANATION OP THE PLATES.<br />
rig. C. Dys'uUa digitifera. The type specimen, from Albany<br />
Island, 8 fms. ; in spirit ; growing over Hydroid zoophyte.<br />
Nat. size.<br />
D. GladocJialina diffusa. One of the type specimens, from<br />
Singapore, between tide-marks ; in spirit. Reduced to<br />
two thirds nat. size. d. Portions of primary and secon-<br />
dary fibre of vertical section, x 95. d' . Detached<br />
spicule, X 190.<br />
E. Ilymeniacidon agminata. The type specimen, from Port<br />
Jackson, 0-5 fms. ; in spirit. Eeduced to two thirds nat.<br />
size.<br />
F. Basjjailia clathrata. Basal portion of type specimen, from<br />
Thursday Island, 3-4 fms. Nat. size.<br />
g. Euspongia offcincdis, var. cavernosa. Vertical section of<br />
type (dry) specimen, from Torres Straits, x 38.<br />
7i. Psammojpemma densum, var. subjtbrosa. Yertical section of<br />
type (spirit) specimen, from Torres Straits, x 38. [The<br />
surface faces to the right.]<br />
{. CladocJialina nuda. Portion of vertical section of type<br />
specimen, from Alert Island, showing the contained spi-<br />
cules. X 190.<br />
j. C. nuda, var. ahruptlspicida. Spicules of type specimen<br />
from Thursday Island, x 190.<br />
Tc. Chalina monilaia, portion of primary fibre of vertical<br />
section of type, from Port Jackson, showing the contained<br />
spicules, X 370. k'. An isolated spicule, x 370.<br />
I. GladocJialina subarmigera, portion of primary and secon-<br />
dary fibres of vertical section, V, spicules, of type specimen,<br />
from Warrior Reef, x 190.<br />
m. Toxoclialina foUoides, fibre of main skeleton as seen in<br />
vertical section, m'. Skeleton-spicule, x 68. m". Tri-<br />
curvate flesh-spicule, x 370. From specimen from Port<br />
Darwin.
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