A MONOGRAPH OP THE TERTIARY POLYZOA OP VICTORIA. 91 



Zocecia ovate, distinct ; a series of pores or deep areolae round the margins, the 

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

 arched ahove, having a broad squared median denticle ; peristome thickened and 

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

 larium much larger and extending down the zooecium. 



S.P. ; M.O. ; M. Living. Europe and North America and Australia. 



In one of the Muddy Creek specimens the avicularian mandible is very large, 

 much expanded inferiorly, and extends half way down the zooeciuni. In the 

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

 is more rounded above. 



2. IP. punctata, n.sp. PI. XII., figs. 8, 10, 11. 



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

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

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

 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. P.flabellaris, n.sp. PL XII., fig. 12. 



Zoarium narrowly flabellate, bilaminate. 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, which last, however, 

 may not be constant. 



4. P. marsupium, McG. PL XII., fig. 9. 



Lepralia marsupium, McG., P.Z.V., 35 ; Toretla marsupium, 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 



