Dr. J. E. Gray on Hyalonemata. 275 
nearly to the apex of the coil. The cavity is partly filled up 
with irregular contorted plates of different sizes, project- 
ing from the wall of 
the cavity. The parietes 
are thin; the upper edge 
of the cavity is thin, 
sinuous, and not show- 
ing any indication of 
having been attached to 
any marine body. ‘The 
apex of the coil is sunk in 
one side of the wall of the 
large cup-like sponge. 
The second specimen is 
somewhat like the former; 
but the upper part of the 
wall is broken away, the 
parietes are thickened, 
and there are three un- 
equal conical concavities, 
the middle one much 
deeper than the rest. 
The third specimen is 
much more imperfect. It 
is a Square spongy mass, 
which has been crushed 
and disintegrated ; it has 
only a  moderate-sized 
central conical concavity ; 
but a great part of the cup 
is wanting. 
As far as I have seen, 
all the sponges are more 
or less cup-shaped, with 
a central conical open 
cavity. 
2. Hyalonema Schultzet is 
probably a distinct 
species, as it came 
from the Philippines; 
but it is described 
probably from a dead 
specimen of a coil 
that had lost its bark 
and animals. 
ae b. 
Hyalonema Sieboldii, growing in the mud; 
reduced to } the natural size. a. the 
contracted polypes on the apex, larger ; 
b. the parasitic sponge on the apex. 
