146 A MONOGRAPH OF THE TERTIARY POLYZOA OP VICTORIA. 



" Zoarium branched, tlie main branches mostly horizontal, with numerous 

 short branches turned upwards, the secondary branches consisting of bundles of 

 zooecia, all opening by closely-packed prismatic orifices ; surface punctate, faintly 

 sulcate longitudinally and (especially in older parts and on the back) transversely 

 corrugated. " — (McG.). 



B. 



2. F. disticM, McG. PL XXII., fig. 5. 



Zooecial tubes prismatic, arranged in lobate folds and along the summits of 

 which they open. Folds very variable in size and shape and indefinitely arranged. 

 Apertures roundedly polyhedral or oblong. Outer walls smooth. Zooecial tubes 

 connate, but with the line of junction clearly marked by a groove. Apertures at 

 times closed by a concave calcareous plate. 



B. 



Which is the attached part is not clear from the nature of the specimen, as the 

 zooecia look in all directions, the lobes being equally developed all round the 

 zoarium. 



Frondipora, Imperato. 



" Zoarium pedunculate, ramose ; fasciculi oj)enmg only on one side of the 

 branches in raised patches." — (Busk). 



Disctoubigera, D'Orb. 



Zoarium discoid, fixed by its base. Zooecia in two or three rows opening along 

 the summits of biserial radiating ridges. 



D. gambierensis, Waters. PI. XXII., fig. 10. 



Pavotubigera gambierensis, Waters, Q.J.G.S., XL., p. 692. 



" Zoarium apparently adnate. Zooecia in bundles of two or more, erect connate. 

 Ovicell an inflation of the portion of the surface between the zooecia ; surface of 

 zooecia evidently finely punctate." — (W.). 



M. Mt. Gambier (W.). 



The figured specimen is a fragment, the broken edge being the lower one in 

 the figure, while the other edges are entire. The under-surface shows strongly- 

 marked concentric rugae, the imaginary centre round which they are developed 

 being placed some distance below the broken edge of the figure. 



