T
I
Fig. G. Reniera cribriformis. The most complete of the fragments,
representing the typo specimen, from the exterior. In
spirit. From Seychelle Islands, 12 fms. X |.
H & H'. R . camerata. Two fragments, probably belonging
to one (the typical) specimen. H shows the compact,
even character which distinguishes the outer surface ;
H' the chambered or plicate condition of the interior.
In spirit. From Marie Louise Island, 16-17 fms. Nat.
size.
1. Clathria mæandrina. Part of the type specimen, incrusting
a stem. In spirit. From Marie Louise Island, Amirantes,
17 fms. Nat. size.
J. C. frondifera. The largest specimen obtained ; attached to
rock. I t shows a transition from a flattened expanded
(y) to a rounded trabecular ( / ) form of tho constituent
lobes of sponge-substance, and exhibits more definiteness
of form as a whole than is usual in the species. Dry.
From Providence Beef, 24 fms. Nat. size.
Iv. C. decumbens. The type specimen, showing considerable
variation in the proportionate amount of fenestration to
the surface {e. g. at Ic the surface is entire, at Ic it is regularly
fenestrate) ; at Ic" the surface is abraded. In spirit.
From Etoile Island, 13 fms. Nat. size.
L. Leucortis anguinea. The type specimen, in spirit. From
Providence Beef, 24 fms. x 2. Z, stem.
M. Erylus cylindrigerus. The type specimen, in spirit. From
Providence Beef. Nat. size.
N*. Phyllospongia madagascarensis, var. supraoculata. From
African Island. Dry. N'. Tho same, upper margin of
median lobe, from above, to show thickness of frond and
characters of vents. Nat. size.
* By an inadvertence those figures have been referred to in the text (p. 594)
as M and M'
P l a t e LIV.*
Fig. a. Leucaltis bathybia, var. mascarenica, the two forms of stout
quadriradiate and the triradiate spicules of tho main
skeleton, x 38. a'. The minute tri- and quadriradiates
of tho cloacal surface, x 3 7 0 . From type specimen from
Seychelle Islands.
h. Axinella spiculifera, two sizes of the skeleton-spicule, x 68.
From specimen from Darros Island.
c. A. proliferans, the skeleton-spicule, x 68. From type
specimen from Providence Island.
d. Leucortis anguinea, tho stout acerate, and different forms
of the tri- and quadriradiate spicules of the main skeleton,
X 68. fZ', the slender acerate (?) of the peristome
(the outer end imperfect), x 370. From typo specimen
from Providence Beef.
e. Erylus cylindrigerus, part of the disk-spicule, in profile, x 190.
e', the disk-spicule, from the front (tubercles omitted,
except at apex), x 190; ee", the same, the tubercles, x 300 ;
e " , the cylindrical spicule, two forms, x 68 ; e'", the minute
acerate spicule, young and adult, X 190 ; e'"", larger
stellate spicule, two forms, showing variation in tho number
and spination of the rays, x 190; e""”, the small
stellate, x 370. From specimen from Providence Beef.
f. Espteria gelatinosa, the subspinulate, / ', large, and / " ,
small anchorate (the latter from the front and side),
/ " , bihamate spicules trichite-bundle. x 3 7 0 . From
specimen from Providence Island.
g. Clathria decumhens, the skeleton and echinating aciiato
spicules, X 190. g , the equianchorate flesh-spicule, from
the front and side, x 370. From typo specimen from
Etoilo Island.
Nol«.—Tlie figures in (his Plate have been prepared with the aid of
sketclies, to scale, made by Mr. Eidley.
i'fi
n,t
I.
\