188 
Walcott, is oval in outline, and about 3mm. in the long diameter ; 
the other has a circular outline, with a diameter of about 1 mm. 
Both are moderately common, but I have not secured any example 
of either sufficiently free from matrix to permit of a critical 
comparison wiih figured species, or to figure with a sufficient 
degree of accuracy. 
ZOANTHARIA. 
Protopharetra (?) Seoulari, Htheridge, fils. 
Trans. Roy. Soc. 8. Aust., vol. XIII, p. 18, t 2, fies. 5-7, 
1890. 
Ethmophyllum Hindei, Ltheridye, fils. 
Op. cit., p. 14, t. 2, figs. 1-43~8._3, figs. 9, 10. 
Coscinoeyathus Tatei, Zheridye, fils. 
Op. cit., p. 17, t. 3, figs. 3-5 (non figs. 1,72, and 6-8). 
Coseinoecyathus (?) Etheridgei, spe’. ov. 
C. Tatei (pars), Etheridge, fils, op. cit., t. 3, figs. 1-2, 6-8 (non 
figs. 3-5). F 
The coral to which I would restrict the name of C. Z’atet, which 
comes from the Ardrossan limestone, is cup-shaped, very rapidly 
enlarging, with the basal part consisting of vesicular tissue. From 
that species I separate the specimens from the Flinders jRange, in 
which the septal structure is meandriform amongst vesicula? tissue. 
The habit of the two corals is so very different as to suggest 
generic distinction, though it would seem that the anatomical 
characters are identical. 
SPONGIDA. , 
Girvanella, sp., Htheridge, fils. Op. cit., p. 19, tab. ii, fig. 8. 
Hyalostelia, sp. 
Zittel’s Hyalostelia comprises a genus of paleozoic spo 2ges 
with siliceous spicules and of hexactinellid type. Their remains 
are not uncommon in the Carboniferous limestone of Scotland, 
Ireland and the North of England. The long spicular rods 
attracted attention as early as 1844, when McCoy referred ichem 
to the Annelida, figuring them in his “Carboniferous Foss:ils of 
Treland ” under the name Serpula parallela. On the disco Very 
in the Scotch beds of six-rayed spicules in association with the 
rods, its affinity with the sponges was at once apparent, and led 
to its being classed with Hyalonema, or “ glass-rope sponge fis 
the present seas. A better aquaintance with the fossil-f-orms 
revealed differences of structure from the existing genus; that 
has led Zittel to still further amend the classification by setparat- 
ing the palxozoic forms from the recent under the gener-i¢ name 
of Hyalostelia. € 
