A MONOGRAPH OF THE TERTIARY POLYZOA OF VICTORIA. 91 



Zooecia ovate, distinct ; a series of pores or deep areoke round the margins, the 

 rest of the surface usually smooth ; thyrostome subtriangular, wider and slightly 

 arched above, haviug a broad squared median denticle; peristome thickened and 

 inclosing a small avicularium -with broad rounded mandible ; sometimes the avicu- 

 larium much larijer and extending down the zooeciura. 



S.P. ; M.C. ; M. Living. Europe and North America and Australia. ^ 



/s^^' 



1 • !■■ 



In one of the Muddy Creek si)ecimens the avicularian mandible is very large, 

 much expanded infcriorly, and extends half way down the zofficiimi. In the 

 Moorabool specimens the zocEcia are larger and nearly quadrate, and the thyrostome 

 is more rounded above. 



2. F.imuctata, n.sp. PI. XII., tigs. 8, 10, 11. 



Zooecia ovate, separated by narrow raised margins, surface depressed within the 

 margins, convex, the part beloAV the thyrostome raised and smooth, the rest witli 

 numerous small pores ; thyrostome rounded above, contracted below ; within tlie 

 lower edge of the peristome a small avicularium. 



B.; M. 



In the Moorabool specimens the zooecia are much wider and the margins more 

 raised than in those from Bairnsdale. I am not quite certain if there is a median 

 denticle. It may perhaps be a variety of P. concinna. 



3. F.Jlabellaris, n.sp. PI. XII., fig. 12. 



Zoarium narrowly flabellate, bilamiuate. Zooecia elongated, narrow, convex, 

 without raised margins ; surface with numerous small round pores ; thyrostome 

 rounded above, contracted below, with a rounded sinus within which is an 

 avicularium resting on a small squared denticle. 



M. 



Differs in the form of the thyrostome from the preceding, as well as the smaller 

 size of the zooecia and the erect, somewhat flabellate growth, Avhicli last, however, 

 may not be constant. 



4. P. mm'sujnum, McG. PI. XII., fig. 9. 



Lepntlia marsupium, McG., P.Z.V., 35 ; Porella marsupiam, Hincks, A.M.N. H., 

 1881 ; McG., T.R.S.V., 1882. 



Zoarium crustaceous. Zooecia small, distinct, ovate, arranged more or less in 

 linear series ; surface smooth, minutely punctured or areolated at the margins ; 



N2 



