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 

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

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

 helow. Tlio aviciilarium is naiTow. and situated in a central depression. 



In the form porrecla the margins ar(> tliickov, the front surface more regular 

 and not grooved, and 1h(> pores Ini'ge and imiform ; the avicularia arc large and 

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



In a third form, liihtJosa, fi'om Bairnsdale, the peristome is much pi'oduced 

 forAvards so as to lie almost tuhular ; the hranches are mucli tliinner, cylindrical, 

 and liaving four or five zofecial series. The zocecia are projmrtionally nuich hroader, 

 wider at the middle opposite the thyrostomes of the zcxecia in tlie contiguous rows; 

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

 raised. 



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



Zoarium hilaminate. Zoa>cia elongated, separated by slightly raised margins ; 

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

 thyi'ostome rounded ahove, contracted helow, and with a narrow sinus in the lower 

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

 thyrostomc a small, Ijroadly elliptical aA-icularium, witli the mandible directed 

 straight downwards. 



S.P. 



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

 viewed from behind. It may possil)ly l)i' a form of aS'. latei, but I think it is a 

 distinct species. 



Cucullipora, n.g. 



Zoarium erect, hilaminate. Zocecia distinct, thyrostome lofty, obliqiie, arched 

 a1)ove, straiglit Ijelow ; peristome thickened and mneh raised, excejit on tlie lower 

 lip, forming a sf rong cncuUate [)rojection above and on the sides ; avicularia 

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

 peristome. 



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



Zoarium nai-row, ligulate. Zooeeia distinct, alternate in two rows on each side 

 of the zoarium ; surface sulcate, finely granular and with numerous small i)erfora- 

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

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



