96 A MONOGRAPH OF THE TERTIARY POLYZOA OF VICTORIA. 



In the typical form there is a groove down each side of the front of the 

 zooecium containing the pores, which are comparatively small and irregular. Some- 

 times, instead of the two grooves, there are three, indistinct and irregularly united 

 below. The avicularium is narrow, and situated in a central depression. 



In the form porrecta the margins are thicker, the front surface more regular 

 and not grooved, and the pores large and uniform ; the avicularia are large and 

 frequently somewhat raised. It is by far the commonest form. 



In a third form, tiibulosa, from Bairnsdale, the peristome is much produced 

 forwards so as to be almost tubular ; the branches are much thinner, cylindrical, 

 and having four or five zocecial series. The zooecia are proportionally much broader, 

 wider at the middle opposite the thyrostomes of the zooecia in the contiguous rows ; 

 the pores are numerous and indistinct ; and the avicularia are very narrow and 

 raised. 



13. S. areolata, n.sp. PL XII., fig. 30. 



Zoarium bilaminate. Zocecia elongated, separated by slightly raised margins ; 

 a series of small, usually pointed areolae along the margins, directed inwards ; 

 thyrostome rounded above, contracted below, and with a narrow sinus in the lower 

 lip, and inside a central squared denticle and two small lateral teeth ; below the 

 thyrostome a small, broadly elliptical avicularium, with the mandible directed 

 straight downwards. 



S.P. 



The internal denticles can only be distinctly seen when the anterior wall is 

 viewed from behind. It may possibly be a form of S. tatei, but I think it is a 

 distinct species. 



Cucullipora, n.g. 



Zoarium erect, bilaminate. Zooecia distinct, thyrostome lofty, oblique, arched 

 above, straight below ; peristome thickened and much raised, except on the lower 

 lip, forming a strong cucullate projection above and on the sides ; avicularia 

 lateral by the side of the thyrostome, and with the sides raised somewhat like the 

 peristome. 



1. C. tetrasticha, n.sp. PI. XIII., fig. 13. 



Zoarium narrow, ligulate. Zooecia distinct, alternate in two rows on each side 

 of the zoarium ; surface sulcate, finely granular and with numerous small perfora- 

 tions ; thyrostome with a small deep denticle (not always visible) on either side ; 

 peristome rising abruptly on each side and much projecting forwards ; an 



