104 A MONOGHAni OF THE TERTIAUV POLYZdA OF VICTORIA. 



2. P. crihroria, n.sp. PI. XIA^, fig. 25. 



Zoarimn eylindric'il. Zorecia largo, altovnate in longitudinal sorios, separated 

 laterally by distinct raiscnl margins, elongated, (]u;idvat(> ; surface^ convex, with 

 numerous rounded deep pits; tliyrostomc aridied above, nearly straight below, 

 pcH'istome thickened ; a large rounded peristomial pore below the lower li]) ; a large 

 sessile aviculai'ium on each sid(> ol' the thyrosiome, witli tlie triangulai- mandible 

 directed inwards and the rostrum incorporated at ils extremity willi the ])('rist()me. 



S.r. ; H. 



A very handsome and distinct species. 



3. P. larvHlis, McG. Tl. XIV., fig. 20. 



LeproJia hn-ralis, McG., P.Z.V., 37; Porh/a hnn,H><, Waters, Q.J.G.S , 1S82, 

 p. 509. 



Zoarium encrusting. Zofocia indistinct, surface (Mitirely occupied by large 

 round pores ; thyrostomc 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 liaving a similai' ridgt; on the outside of each ; avicularia (not always 

 ])r('si'nt) large, with triangular mandibles, below or to the side of the peristomial 

 ])ores. 



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



In recent specimens there is usually a lliiek cpillu'ea covering the front of the 

 zococia, but not closing the peristomial pores. 



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

 ojienings, but am not quite satisfied as to the ])r()))riely of doing so. It may ])ossibly 

 prove to be a Iliantopora. 



Family TuBrcicLLAitTTD.E. 



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

 imaginary axis, convex, distinct ; thyrostome ])roduced into a tubidar ])eristom(\ 

 Xo avicularia. 



Tubucellaria, D'Orhifjny. 



Zoarium consisting of cylindrical interno(l(>s, connected by corneous tub(>s. 

 Zodicia ventricose above and attenuated downwai'ds ; usually a simple circular 

 median pore; surface punctuate, porous or reticulate. 



