'Alert' 1881-2

682 JiXPLANATION OF THE PLATES.
Fig. G. Reniern cribriformis. The most complete of the fragments,
representing the type specimen, from the exterior. In
spirit. From Seychelle Islands, 12 fms. x |.
H & H'. B. 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.
I. ClatJiria ma'andrina. 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. ' It shows a transition from a flattened expanded
(j) to a rounded trabecular (f)
form of the constituent
lobes of sponge-substance, and exhibits more definiteness
of form as a whole than is usual in the species. Dry.
From Providence Ileef, 24 fms. Nat. size.
K. C. decumbens. The type specimen, showing considerable
variation in the proportionate amount of fenestration to
the surface (e. g. at h the surface is entire, at Ic' it is regu-
larly fenestrate) ; at h" the surface is abraded. In spirit.
From Etoile Island, 13 fms. Nat. size.
L. Leucortis anguinea. The type specimen, in spirit. From
Providence Eeef, 24 fms. x 2. Z, stem.
M. Erylus cylindrigerus. The type specimen, in spirit. From
Providence Eeef. Nat. size.
N*. Pliyllospongia onadagascarcnsis, var. supraoculata. From
African Island. Dry. N'. The same, upper margin of
median lobe, from above, to show thickness of frond and
characters of vents. Nat. size.
* By an inadvertence these figures h".. 3 been referred to in tlie text (p. 504)
as M and M'
;