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674 EXPLANATION OE THE PLATES.
Fig. z. Gellius cymiformis. Spicules, x 370. From specimen from
Thursday Island.
aa. Crella schmidti. Spicules (anchorate from front and side),
X 370. From type specimen from Port Jackson.
hh. Gelliodes fihulata, fibre of part of vertical section, showing
the very st6ut and straight primary and the secondary
fibres; hh', portion of secondary fibre, showing arrangement
of spicules and isolated skeleton-spicule: x 68.
hh". Bihamate spicules, x 370. From dry specimen from
Prince of Wales Channel.
cc. Amphilectus tibiellifer, skeleton acuate and tibiella-spicules,
X 190 (head of latter enlarged), cc . Tricurvate acerate,
X 190. cc". Anchorate seen from front and side, x 370.
From one of the types from Prince of Wales Channel.
P late X L II.
Fig. a. Alyxilla arborescens, portion of vertical section, x 190.
a'. Skeleton acerate spicules, x 190. a". Equianchorate
spicule from front and side, x 370. From type specimen
(iu spirit) from Port Jackson.
h. Acarnus ternatus, acuate, grapnel, and tricurvate spicules,
and head of grapnel as seen from above, x 190. V . Tibiella
and equianchorate (from front and side) spicules,
X 370. From specimen from West Island, Torres Straits.
c. Ophlitispongia australiensis, fibre of vertical section, x 190.
c'. Skeleton cylindrical and echinating acuate spicules,
X 190. From type specimen from Port Molle.
d. Clathria tuherosa, vertical section, x 38. From specimen
in spirit from Prince of Wales Channel.
e. lotrochota purpurea, vertical section, and e', dermis, x
20. e". Two sizes of skeleton-spicule, x 190. e'". Birotulate
spicules, X 370. From dry specimen from Prince
of Wales Channel, e"". Two ciliated chambers, from
specimen of green var. from Amirante Island, x 370.
/ . I . haculifera, tibiella-spicule of dermis, x 370. From
type specimen from Port Darwin.
F
Fig. g. Phoriospongia fibrosa, cjdindrical, bihamate, equianchorate
I.
(from front and side) spicules, x 370. From t}>pe specimen
from Prince of Wales Channel.
h. Esperia pellucida, skeleton acuate spicule, h’, large (from
front), h", small ineqnianchorate (from front and side);
Jl", bihamate spicule; and h"", trichite-bundle, x 370.
From type specimen from Alert Island, Torres Straits.
Olathria coppingeri, small and large spined acerate, and
smooth variety of end of latter, and smooth subspinulate
spicules, X 190. i', equianchorate spicule (from front
and side), X 370. From specimen from Albany Island,
0. frondifera, smooth acerate spicule, three sizes, X 190,
/ , spined acuate, two forms, x 190 ; f , tricurvate spicule,
and f " , equianchorate (from front and side), x 370. From
specimen from Fitzroy Island, Queensland.
Ic. G. aculeata, smooth acuate and subspinulate, and spined
acuate spicules, xl90. Ic, tricurvate, and Ic", equianchorate
(from front and side), x370. From type
specimen from Thursday Island.
I. Raspailia bifurcata, portion of fibre from near base, showing
spined acuate spicule in situ, x 190. V, smooth
acuate and acerate spicules, x 38. From type specimen
(in spirit) from Prince of Wales Channel.
m. R . australiensis, part of vertical section from near middle
of Sponge, X 38. m', larger and smaller acuate spicules,
X 68. From type specimen (in spirit) from Port
Darwin.
n. R h a p h id o p h lu s arborescens, smooth and spined acuate
spicules, and head of spinulate variety of the former, x 190.
ri. Equianchorate seen from the front, X 370, From type
specimen from Friday Island,
0. R . procerus, part of vertical section, X 68. o', skeletonspicules,
X 68 ; o", fiesh-spicules, X 370. From type
specimen (in spirit) from Port Darwin.
» This figure has been erroneously referred to as fig. i in the text on p. 448.