A MONOGRAPH OF THE TERTIARY POLTZOA OP VICTORIA. 127 



4. H. curva, n.sp. PL XVIII., fig. 6. 



Branches slender, nearly cyclindrical, dichotomously divided, curved and 

 slightly twisted. Zooecia distinct, very long, turned sharply forwards at the anterior 

 extremities ; the thyrostomes being prominent, circular and entire ; surface closely 

 covered with minute prominences. Posterior surface longitudinally sulcate and 

 transversely rugose, destitute of pores and having the ridges thickly covered with 

 similar elevations to those on the front. 



M.C. A single specimen. 



5. H. elevata, n.sp. PL XVIII., fig. 9. 



Branches dichotomously divided. Anterior surface obscurely fibrillate, the 

 fibrillae smooth and little prominent and with a few small pores in the sulci. 

 Zooecia raised anteriorly and frequently joined by lateral elevations separated by 

 oblique depressions or furrows, and giving the whole an obliquely serial appearance ; 

 thyrostomes circular, peristome raised and entire. Posterior surface sharply longi- 

 tudinally fibrillate, the fibrillse prominent and smooth. 



Belmont. 



6. H. foliacea, McG. PL XIX., fig. 1. 



Hornera foliacea, McG.. P.Z.V., pi. 118; Waters, Q.J.G.S., XL., p. 688; 

 Retihomera foliacea, Busk, B.M.O., Pt. III. 



Zoarium formed of subparallel branches, dichomotously divided and joined at 

 irregular intervals by usually non-celliferous cross-bars. Anterior surface divided 

 into elongated pointed areas by prominent, well-marked fibrillse, each area containing 

 a zooecium ; several pores in the areas ; thyrostome slightly projecting in the 

 central cells, thickened and emarginate above, in the lateral cells more produced 

 and lacerated. Dorsal surface strongly fibrillate with pores between the fibrillae. 



M.C; B. (W.). Living. Victoria. 



This is a common living species fully described in P.Z.V. The expanded 

 zoarium is formed by dichotomously-dividing branches, connected at irregular 

 intervals by straight transverse bars. These bars, as a rule, are entirely non- 

 celliferous, although occasionally a zooecium from the branch is incorporated in it. 

 In one specimen some of the branches anastomose directly without the intervention 

 of the cross-bars, but in parts there is the usual non-celliferous connection. The 

 fossils do not shew ooecia ; in recent specimens they are large and dorsal. 



7. S. sulcata, n.sp. PL XIX., figs. 2, 6. 



Zoarium massive, branches thick, irregularly divided. Anterior surface strongly 

 longitudinally fibrillate, the ridges thick and separated by deep sulci with elliptical 



