138 A MONOGRAPH OF THE TERTIARY POLTZOA OF VICTORIA. 



Diastopora discoid ea, McG. PL XX., fig. 3. 



Zoariuni discoid, raised on a slight stalk, base flat; basal lamina finely 

 punctate, and, in the only specimen, in places finely rcticulately porous. Zooecia 

 arranged in single broken rows which run from the centre outwards in curved lines. 

 Walls porous. At the edge the zooecia become much crowded, so as to give the 

 entire margin a cancellated appearance. Spaces between the zocecia covered by a 

 finely punctate transversely wrinkled lamina. 



S.P. 



Liripora, McG. 



"Zoarium crustaceous, growing on a basal lamina. Zooecia not projecting, 

 arranged in single or multiple series, forming raised ridges radiating more or less 

 regularly from a central part, opening along the summits of the ridges or towards 

 their extremities, intervening grooves occupied by a punctate calcareous membrane." 



—(McG.). 



L. bicolor, McG. PL XX., fig. 8. 



Diastopora bicolor, McG., T.R.S.V., 1884, p. 117. 



" Zoarium nearly circular, consisting of three parts ; a central elevated portion 

 composed of perfect cells, surrounded by a broad fringe of imperfectly-developed 

 cells, beyond which is a thin lamina." . . " The central portion is much raised, 

 flat, and depressed at the centre. The cells are arranged in irregular radiating 

 series; the series are distinct, but without intervening spaces. The cells are 

 slightly rugose, and thickly punctate. The mouth is oval or elliptical, with slightly 

 thickened margin ; those of the marginal cells are open, most of the inner being 

 filled in by a plate punctate or perforated like the rest of the cell. In the central 

 part are numerous rounded eminences, mostly at the commencement of the series 

 of cells, and of the same width ; they are punctate or perforated in the same manner, 

 but present no trace of mouth. The surrounding fringe consists of a broad layer of 

 imperfectly-developed cells ; the thin lamina beyond this is marked with slight 

 radiating grooves, as occurs in the corresponding part of other species of Diastopora 

 and Discoporella" — (McG.). 



M.C. Living. Victoria. 



The above description is taken from a recent specimen, but with the exception 

 of the projecting basal lamina, which has disappeared, might have been written of 

 the single specimen from Muddy Creek. 



2. Z.fasciculata, McG. PL XXII., figs. 4, 7. 

 Diastopora fascicnlata, McG., T.R.S.V., 1884, p. 97. 



