NO. 9 TERTIARY BRYOZOA CANU AND BASSLER 7 



mural rim is thin, salient, sharp, smooth ; the cryptocyst is flat, smooth, 

 little deep, as long or longer than the opesium ; it bears on its proximal 

 portion a large transverse, triangular avicularium, with denticles, and 

 in which the beak is very pointed and often slightly curved ; the 

 opesium is elongated, elliptical, narrowed distally by two small con- 

 dyles symmetrically placed. The ovicell is hyperstomial, placed on 

 the cryptocyst of the distal zooecium, globular, smooth, crowned by 

 a zooecial avicularium. 

 Measurcuicnts. — 



. r//o = 0.20-0.25 mm ^ . rL.c: = 0.60-0.6 S mm 

 Upesuim-^ , ^^^ ^ Zooecium-^ , 



f 1^/0 = 0.13-0.15 mm I /.c = 0.32-0.35 mm 



Number of zooecia in 4 mm\ 21. 



Occurrence. — Balcombian beds at Muddy Creek and Janjukian at 



Dartmoor, Victoria. 



Holotype.—V.S.^M. nos. 85850, 85853. 



Family HIANTOPORIDAE MacGillivray, 1895 



TREMOPORA Ortmann, 1890 



TREMOPORA ORBICULATA, n. sp. 



Plate 2, fig. 3 



Description. — The zoarium is unilamellar ; the dorsal bears fenes- 

 trae. The zooecia are distinct, separated by a deep furrow in which 

 the connecting tubes are visible, orbicular, or slightly elongated. The 

 mural rim is thin distally and very much enlarged at the base ; it 

 bears two large distal spines and laterally a l^rge elliptical avicularium 

 placed very high, opposite which is situated a small avicularium or a 

 short bifurcated spine. The opesium is elliptical or orbicular, of the 

 same form as the zooecium. 



Measurements. — 



, r/zo = 0.50 mm . rL£r = 0.60-0.70 mm 



(Jpesmm-< , ^ ^ ^^ Zooecuim-^ , ^ ^ 



i [ /(9 = 0.40-0.50 mm I /.:: = 0.60-0.65 "ii" 



Occurrence. — Balcombian beds at IVIuddy Creek, Victoria. 



Holotype.—'U.S.^.'M. no. 85894. 



TREMOPORA STAMINIS, n. sp. 



Plate 2, figs. 4, 5 



Description. — The zoarium is unilamellar, free. On the dorsal the 

 fenestrae are short, linear, narrow, and separate the six more or less 

 broad connecting tubes. The surface is convex, smooth, ornamented 

 with small salient radicular pores. The zooecia are distinct, separated 



