ed to associate the two specimens; if this is justifiable, | 
the double wall of fig. 32, and the porous structure of fig. 
34, suggest an aberrant type of the Archaeocyathinae. We 
propose the following names:— 
Heterocyathus minor (new genus and species). Fig. 32. 
Heterocythus major (new species). Fig. 34. 
We hope that further material may be forthcoming to 
fully define the structure of these interesting forms. 
PORIFERA. Figs. 35, 36. 
Besides isolated spicules, we have found more or 
complete specimens of two interesting sponges. We are 
not aware that these forms have been previously describ- 
ed from foreign localities, and, not being in a position to 
examine the literature, name them provisonauy as follows. 
Uranosphaera polyaster (new genus and species}. Fig. 35. 
less | 
| 
! 
The specimen is a segment of а hollow sphere, which | 
would have been about 27mm. іп diameter. There appears | 
to be an opening, 8mm. diameter, surrounded by a thick- | 
ened rim. The wall is composed of spicular elements, 
each of which has the form of a star with about a dozen 
rays; many of the rays branch into two or three points 
(which is not properly brought out in the sketch). Each 
spicule is convex on the outer and concave on the inner 
surface; as far as we can judge the rays do not depart 
much from the curved surface of the wall, and the spic- 
ules are rather of the nature of bodies of two dimensions 
than of spherical bodies with rays proceeding in all direc- 
tions. ‘The spicules are about 5mm. apart, centre to cen- 
‘tre, and, as they may be mm. or more in diameter, the 
rays of neighbouring spicules often interdigitate or cross | 
one another. The lower sketch shows the deeply etched 
c) 
dune a ur A A A 
edge of the fragment from the inner or concave surface. 
Only ohe specimen has been found; but another fragment 
is very similar, with smaller spicules. 
Uranosphaera hexaster (new species). Fig. 36. 
The specimen is a segment of a hollow sphere, about 30 
mm. diameter. The spicules are much smaller than those 
of U. polyaster; they are about 2 to 3mm. diameter, and 
are less uniform in size; they have six rays and, for the 
most part, neighboring spicules are separated by an in- 
terval of 1 or 2mm; this feature is not, however, constant, 
as some are in contact, and in other cases minute spicules 
of similar form can be detected between the larger ones. 
Whether an.opening was present, as in the previous spe- 
cies, is uncertain. 
? CALCAREOUS ALGA. Fig. 33. 
We add a sketch of a branching organism which may 
be a calcareous Alga. It is interesting as being one of 
the very few organisms, apart from Archaeocyathinae, 
sponge spicules and a Brachiopod, which we have found in 
this material. 
Besides the Archaeocyathinae herein described we have 
a good many specimens from Beltana which await further 
elucidation, as well as one or two interesting forms which 
have come to light while this paper was in preparation for 
the press. We hope to be able to deal with these at a 
later date, together with several species from other local- 
ities in which we have collected, and also to comment on 
some of Taylor's species as to which our material furn- 
ishes fresh information. 
RSS A 
HODES 
“West Coast Recorder” Print, Port Lincoln, 
