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Vega. The shape of the sponge agrees well with tlie figure
of Clathria coppingeri S. 0. Ridley, given in »Report on the
zoological colleetions made in the Indo-Pacific Ocean during
the voyage of H. M. S. »Alert» 1881—1882», pag. 445, Plate 40,
fig. F. It is erect, irregularly ramous. The branches, issuing
from a tolerably short, firm pedicle, are divided into
nume-rous slender branches. These branches are united by lateral
branches, forming a net-work of subquadrangular cells, which
are often filled up with tlie softer sponge-substance. The
pedicle and the branches are of a very firm consistency.
The other tissue is soft, Oscula and poi’es are not visible.
The length of the specimen represented by figure 24 in Plate 30
is 170 mm, and its breadth about 160 mm. The thickness is
10 mm. The diameter of the pedicle is 15 mm, that of the
branches only 2 mm. The sponge is attached to stones and
other hard objects, growing as an Axinella O. S. The basal
attaehment of this sponge is expanded.
The skeleton. consists of acuate (sometimes subspinulate)
spicules and of inequianchorate spicules.
The acuate spicules (Plate 25, fig. 70) are straight or slightly
curved, smooth, tapering from the middle towards the base and
the sharp point, Thev are sometimes slightly inflated at tlie
base. The length is 0,35—0,45 mm.
The inequianchorate spicules (Plate 25, fig. 71, 72) are of two
kinds. The large ones are congregated in rosette-shaped groups,
resembling those of Esperia lingua Bow. (O. S.), the spicules of
each rosette of Clathria however being fewer. The length is
0,i mm. These rosettes are very numerous in the inner, softer
membranes.
The smaller anchorate spicules are not congregated in rosettes;
their length is only 0,o35 mm. They occur dispersed in a very
eonsiderable number.
I have seen a few minute acerate spicules, trichites, the
length being 0,os mm, in only one small portion of the sponge
preserved in Canada-balsam; but I have not figured these
spicules, as they are so few, and possiblv do not belong to this
species.
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