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668 EXPLANATION OP THE PIATES.<br />
[D' shows the naked calcareous axis of one of its branches.]<br />
D". Portion of J)', x 6. From Port MoUe.<br />
Pig. E. Acabaria serrata. Portion of larger specimen in spirit, nat.<br />
size. E'. Portion of second joint above first bifurcation,<br />
of same specimen, from Port Darwin, 7-12 fms., x 6.<br />
E. Iciligorr/ia orientalis. Type specimen,, in spirit, reduced to<br />
one half nat, size. F'. Portion of left-baud branch, the<br />
margin as seen from the side, showing the depressions for<br />
the zooids and the common groove which contains them,<br />
x2. F". Portion of main stem just below bifurcation,<br />
from front, showing four exsert zooids. From Torres Straits,<br />
10 fms.<br />
Plate XXXVIII.<br />
Fig. a. Mopsella clavigera, cortical clavate, a', cortical bifurcate,<br />
and a" & «'", Blattkeule spicules, x 100.<br />
i. Melitodes albitincta, fusiform, and h' , small nodular cortical<br />
spicules, X 100.<br />
c. Acaharia serrata, long, and c', short verruca-spicules ; c",<br />
short, and c'", long cortical fusiform spicules. All x 150.<br />
d. Echinomuricea indo-malaccensis. d & d', chief forms of the<br />
toothed spicule of the verruca, d" & d'", cortical spicules.<br />
All x70.<br />
e. Iciligorgia orientalis. Chief forms of spicules, X TO.<br />
/. Psilacaharia gracillima, cortical, /' & /", verruca-spicules,<br />
X 70. [The ridged cortical spicule has been omitted.]<br />
g. Pleccaura prcelonga, var. tijpica, radiate, and g' , Blatt-<br />
keule cortical spicules, x 70.<br />
Ji. Plecvatira prcelonga, var. cinerea, Blattkeule cortical spicule,<br />
x70.<br />
SPONGES.<br />
Plate XXXIX.<br />
Fig. A. Stelispongus excavatus. Type specimen (dry) from Arafura<br />
Sea. Eeduced to one half nat. size.
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