Tertiary Polyzoa of Victoria. 19 



are rounded, but nearly flat in front, partially immersed and 

 adherent upon the zooecium above. Owing to the primary 

 orifice or thyrostome being hidden by the peristome no internal 

 denticles can be seen, and there are no avicularia upon the 

 zooecia, so I consider it somewhat doubtful if this species should 

 be placed in Smittia. 



I would here wish to observe that owing to the very unsatis- 

 factory state of the classification of the Lepralioid or Escharine 

 group of the Cheilostomata it is impossible, until a thorough 

 revision be made, to correctly and definitely place some of the 

 species described in this paper, but I have tentatively placed 

 them in the genera to which I consider they should be assigned. 



Popella rhomboidalis, n. sp. (PL I., Fig. 4). 



Zoarium encrusting. Zooecia rhomboidal, with very highly 

 raised margins ; nearly flat, with scattered pores over the surface 

 except on a smooth area below the thyrostome. Thyrostome 

 orbicular, with a very wide sinus proximally. 



Z^m///)'.— Mornington (T. S. Hall). 



The greater portion of the only specimen found is figured. It 

 is a very distinct form, the very highly raised margins being 

 very characteristic. The thyrostome is of a very similar form 

 to Porella dennanti described below, therefore I place it in 

 Porella although there is no avicularium within the .sinus. Some 

 of the "pores" do not pass through the cell wall, and show as 

 slight cavities only. 



Popella areolata, n. sp. (PI. I., Fig. 5). 



Zoarium encrusting. Zooecia irregularly hexagonal ; margins 

 narrow ; surface somewhat depressed, with large irregularly 

 shaped areolae round the margin which extend sometimes to the 

 centre. Thyrostome orbicular, with a large rounded sinus, within 

 which is a small avicularium. 



Locality. — Spring Creek (T. S. Hall). 



The very large and irregular areolae are peculiar to this 

 species. 



2a 



