NO. 9 TERTIARY BRYOZOA CANU AND BASSLER 35 



furrow, elongated, vaguely lozenge-shaped, enlarged on the transverse 



axis ; the frontal is convex, smooth, bordered by a double row of 



numerous very small areolar pores separated by small radial costules. 



The aperture is oval, elongated ; theanter is separated by two cardelles 



descending from the poster, which is smaller. The frontal avicu- 



laria are small, triangular, with pivot ; the beak is salient, pointed, 



oriented proximally ; they are placed indistinctly on the first or on 



the second row of pores ; there are two or three on the same frontal. 



Measurements. — 



(lia = 0.20 mm . fL.:r = 0.75-0.95 mm 



Aperturei , ^ Zooecmm-^ , ^ 



^ I /a = 0.1 6 mm I /c = o.6o mm 



Number of zooecia in 4 mm', 10. 



Occurrence. — Balcombian beds at Muddy Creek, Victoria. 



Holotype.— U.S.N. M. no. 85755. 



HIPPOMENELLA RARIROSTRATA, n. sp. 



Plate 7, fig. I 



Description. — The zoarium is unilamellar. The zooecia are distinct, 

 separated by a deep furrow, elliptical, little elongated ; the frontal 

 is very convex, smooth, bordered by a double row of areolar pores. 

 The aperture is large, semielliptical, elongated, with convex proximal 

 border, without peristome. The ovicell is large, buried in the distal 

 zooecium, hyperstomial, closed by the operculum ; its frontal is deco- 

 rated with numerous radial lines of small pores separated from each 

 other by very salient costules ; the latter are arrested at the center by 

 a large smooth, triangular area and a smooth, curved pad serves as 

 the proximal limit. The frontal avicularia are rare, a single one, often 

 absent, to a zooecium, small, triangular, placed very inferiorly on the 

 inner line of areolar pores ; they have a pivot and the beak is oriented 

 proximally. 



Measurements. — 



^ rAa = 0.1 8-0.20 mm ^ . fLs = 0.66 mm 



Aperture--^ , ^ ^a. ^ o Zooecmm-^ , 



^ ] la = 0.1 6-0. 1 8 mm | /:r = 0.45 mm 



Number of zooecia in 4 mnf, 8. 



Occurrence. — Balcombian beds at Muddy Creek, Victoria. 



Holotype.— v. S.N. M. no. 85753. 



HIPPOMENELLA MAGNA, n. sp. 



Plate 8, fig. 13 



Description. — The zoarium is unilamellar. The zooecia are distinct, 

 separated by a deep furrow, fusiform, large, very elongated ; the 

 frontal is convex and formed by a reduced pleurocyst, elliptical, elon- 

 gated, bordered by two or three rows of lateral areolar pores and by 



