NO. 9 TERTIARY BRVOZOA CANU AND BASSLKR 4I 



Measurements. — 



r/?a = 0.1 5 mm „ . rLrr = 0.75-1.00 mm 



Aperturej j^^^,^.^,^ ,,,,,, Zooecimn| i,^^_^^_^^^^ ,,,,,, 



Number of zooecia in 4 mm^, 15. 



Occurrence. — Balcombiaii beds at Muddy Creek, Victoria. 



Holotypc.— U.S.N. M. no. 85843. 



PORELLA CYLINDROROSTRIS, n. sp. 



Plate 7, fig. 9 



Description.- — The zoarium is bilamellar. The zooecia are distinct, 

 separated by a thick thread, very saHent, smooth ; they are elongated, 

 polygonal ; the frontal is little convex and perforated with large ex- 

 panded tremopores. The peristome is thick, smooth, salient, covering 

 proximally the avicularian chamber ; the peristomice is elliptical and 

 transverse or suborbicular ; into the peristomie opens a large cylin- 

 drical avicularium, little salient, in which the orifice (invisible) is 

 perpendicular to the apertural plane. The apertural chamber is large 

 and forms a large convexity, salient, smooth, in front of the aperture. 

 The ovicell is large, convex, marginated, with a fragile orbicular area ; 

 it opens into the peristomie. 



Measurements. — 



, . r/i/> = o.i3 mm . fLs = o.yo-o.y'/ mm 



Peristomice-^ ,^ ^ „ Zooecmm-^ , 



1 Ip = o.iy mm I /.8' = 0.35-0.42 mm 



• Number of zooecia in i mm"", 4. 



Occurrence. — Janjukian beds at Torquay near Geelong, Victoria. 



Holotype.— U.S.N. M. no. 85829. 



PORELLA BACULINA, n. sp. 



Plate 8, fig. 8 



Description. — The zoarium is free, cylindrical, in the form of a 

 baton. The zooecia are distinct, separated by a small salient thread, 

 elongated, elliptical, large ; the frontal is convex and perforated by 

 numerous small tremopores. The peristome is salient, thick, smooth, 

 complete; the peristomice is suborbicular; an elliptical avicularium 

 is lodged in the proximal portion of the peristomie. 



Measurem-ents. — 



.r^ . . r///' = 0.22-0.25 mm . {Ls=i.io mm 



Peristomice^ ,, ^ ^^ Zooecium-^ , 



yip = o.2S mm [^ /5' = o.5o-o.55 mm 



Occurrence. — Janjukian beds at Mitchell River, Bairnsdale, Mount 



Gambler, and Boggy Creek, Victoria. 



Cotypes.— U.S.N. U. nos. 85830-85832, 85848. 



