104 A MONOGRAPH OP THE TERTIARY POLYZOA OP VICTORIA. 



2. P. cribraria, n.sp. PL XIV., fig. 25. 



Zoarium cylindrical. Zooecia large, alternate in longitudinal series, separated 

 laterally by distinct raised margins, elongated, quadrate ; surface convex, with 

 numerous rounded deep pits ; thyrostome arched above, nearly straight below, 

 peristome thickened ; a large rounded peristomial pore below the lower lip ; a large 

 sessile avicularium on each side of the thvrostome, with the triangular mandible 

 directed inwards and the rostrum incorporated at its extremity with the peristome. 



S.P. ; B. 



A. very handsome and distinct species. 



3. P. larvalis, McG. PI. XIV., fig. 26. 



Lepralia larvalis, McG., P.Z.V., 37 ; Porina larvalis, Waters, Q, J.G.S , 1882, 

 p. 509. 



Zoarium encrusting. Zooecia indistinct, surface entirely occupied by large 

 round pores ; thyrostome large, semicircular, straight below, with a large spine 

 articulated close to each angle ; peristome below much developed and forming a large 

 pointed mucro, with two large peristomial pores, separated by a thickened vertical 

 ridge, and having a similar ridge on the outside of each ; avicularia (not always 

 present) large, with triangular mandibles, below or to the side of the peristomial 

 pores. 



M. ; B. (W.) Living. Australia. 



In recent specimens there is usually a thick epitheca covering the front of the 

 zooecia, but not closing the peristomial pores. 



I place this species in Porina on account of the situation of the large suboral 

 openings, but am not quite satisfied as to the propriety of doing so. It may possibly 

 prove to be a Hiantopora. 



Family Ttibitcellariid.e. 



Zoarium erect, branched, branches cylindrical. Zooecia arranged around an 

 imaginary axis, convex, distinct ; thyrostome produced into a tubular peristome. 

 No avicularia. 



Tubucellaria, D'Orbigny. 



Zoarium consisting of cylindrical internodes, connected by corneous tubes. 

 Zooecia ventricose above and attenuated downwards ; usually a simple circular 

 median pore ; surface punctuate, porous or reticulate. 



