144 A MONOGRAPH OF THE TERTIARY POLTZOA OP VICTORIA. 



1. S. nodulosa, McG. PL XXI. 5 fig. 14. 



Zoarium cylindrical. Apertures of zooecia and of cancelli almost confined to 

 swollen annular nodes placed at intervals on the branch. Annuli separated from 

 one another by a distance about equal to their own diameter. Zooecia in each 

 annulus very numerous, irregularly disposed, apertures subcircular, and approxi- 

 mately equal in size. Cancelli very numerous and of various sizes, circular, OA^ate 

 or polyhedral. Both zocecial apertures and cancelli with thickened cord-like 

 margins, which slightly project and leave small polygonal areas between them. 

 Apertures of zocecia and of cancelli at times closed at the outer surface by a 

 calcareous plate, pierced by numerous large circular pores. Internodes marked out 

 into irregular ovate or elongate areas which are pierced by numerous large pores, 

 and are bounded by slightly-elevated broad ridges devoid of pores. One or two 

 large apertures, possibly zocecial, and a large number of smaller apertures occur in 

 each internode. The porous areas apparently mark the position of closed zocecial 

 apertures in the internodes. 



M.C. Upper beds at Maude (T.S.H.). 



A broken specimen in my own collection shows that the zocecia curve upwards 

 and outwards, to open on the surface of the nodes, and that the walls are pierced 

 by a number of large circular pores, placed each at the bottom of a broadly rounded 

 depression, the intervening spaces being minutely granular. 



2. H. pisiformis, McG. PI. XXI., fig. 15. 



Zocecium nearly spherical, apparently free. Surface closely covered by 

 rounded polygonal apertures of varying size, so that it is not evident in many cases 

 which are zocecia and which are cancelli, as all gradations in size are present. 

 Bounding walls of apertures stout. The apertures of all sizes usually closed by a 

 concave porous plate placed slightly within the mouth. 



S.P. 



» 



Family Frondiporid^e. 



" Zoarium massive, stipitate, simple or ramose. Zocecia tubular, connate, 

 continuous from the base, aggregated into fasciculi, opening only at the extremities 

 or in regular series at the sides of the branches. No cancelli." — (McG.). 



Supercytis, TfOrb. 



" Zoarium stipitate ; capitulum expanded, flat or cupped, with numerous 

 furcate or trifid fasciculi projecting round the border. Fasciculi compressed, 



