126 A MONOGRAPH OP THE TERTIARY POLYZOA OF VICTORIA. 



1. H. lichenoides, Pontoppiclan. 



Hornera lichenoides, Hincks, B.M.P., 468; Busk, B.M.O., III., 17 ; Busk, 

 C.P., 15. 



Anterior surface fibrillate, the fibrillae narrow and smooth, the enclosed spaces 

 angular below and having a few pores ; thyrostome elliptical, the peristome elevated 

 and entire. 



S.P. A single small fragment. Living. Europe and Australia. 



2. S.frondiculata, Lamx. PL XVIIL, figs. 7, 8. PL XIX., fig. 7. 



Kornera frondiculala, Busk, B.M.C., III., 17. ; id., C.P., L, 15 ; Waters, 

 Q.J.G.S., XL., p. 687. 



Zoarium robust, branches irregular, subcylindrical, mostly in one plane. 

 Anterior surface with strong, smooth or transversely rugose fibrillse, dividing it 

 into elongated spaces, coiitainiug several pores, for the zooecia ; zooecia with the 

 peristome thickened and eraarginate or bifid above. Dorsal surface strongly 

 longitudinally fibrillate, the fibrillge usually nodulated or rugose, the intervening 

 sulci with numerous pores. 



S.P.; M.C.; C.C. (W.) ; B. (W.). Living. Mediterranean. 



Var. aperta, PL XIX., fig. 7. 



Zooecial spaces large, usually with a distinct pore below the zooecium, the 

 separating fibrillge very prominent, with numerous sharp transverse ridges ; anterior 

 part prominent, the thyrostome much raised at the sides and widely open above so 

 as to have a horseshoe shape. Dorsal fibrillge very prominent, transversely ridged 

 like the anterior, the intervening sulci narrow with well-marked pores. 



The only specimen is very stout, rising from an expanded base. 



3. H. quadrata, n.sp. PL XVIIL, tig. 10. 



Branches slender. Anterior surface divided by wide, smooth or tuberculated 

 ridges into oblong spaces the width of the zooecia and destitute of pores ; thyrostome 

 at the upper extremity of each space projecting, peristome circular, entire. Dorsal 

 surface strongly longitudinally fibrillate, the ridges granular or transversely 

 nodulated, and the intervening sulci destitute of pores. 



S.P. ; M.C. 



Distinguished by its slender branches, the non-porous regular zooecial spaces, 

 the small, round, entire thyrostome, and the non-porous dorsal surface. 



