14 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



elongated, hexagonal ; the cryptocyst is convex and forms a shallow 

 cavity in front of the aperture. The aperture is semielliptical, trans- 

 verse ; the proximal border is straight or a little concave, with two 

 very small lateral indentations. The ovicell is endotoichal ; its orifice 

 is a thin, crescentic slit. The avicularian zooecia have a large semi- 

 elliptical, transverse opesium. 

 Measuremen ts. — 



('/m = 0.1 2-0. 1 5 mm ^ . rL.c = o.7S-o.8o mm 

 Aperture-^ , ^.^^.„ Zooecium-^ , 



i 1^/0 = 0.15-0.17 mm 1 7^ = 0.50 mm 



Occurrence. — Balcombian beds at Muddy Creek, Victoria. 



Holotype.—V.S.NM. no. 85617. 



Family MEMBRANICELLARIIDAE Levinsen, 1909 



OMOIOSIA Canu and Bassler, 1927 



OMOIOSIA ELONGATA, n. sp. 



Plate 3, fig. II 



Description. — The zoarium is free, bilamellar. The zooecia are 

 distinct, separated by their mural rim, elongated, hexagonal, arranged 

 in alternating transverse rows ; the mural rim is thick, salient, triangu- 

 lar in section ; the cryptocyst is deep, concave, very finely granular 

 and entirely surrounds the opesium. The opesium is large, elliptical, 

 elongated, not adjacent to the mural rim, surrounded by a salient 

 thread. The special zooecia are larger but of the same form ; their 

 opesium is elliptical, median, and measures 0.30 by 0.15 mm. 



Measurements. — ■ 



. fJw = 0.20-0.22 mm . rL5;=: 0.60-0.65 mm 



Opesmmv, „ Zooecuun-< , 



i 1/0 = 0.15 mm 1 /.:: = 0.35-0.40 mm 



Number of zooecia in 4 mm\ 24. 



Occurrence. — Balcombian beds at Muddy Creek, Victoria. 



Holotype.— U.S.N. M. no. 86955. 



Division CELLULARINA Smitt, 1867 



Family SCRUPOCELLARIIDAE Levinsen, 1909 



CRASPEDOZOUM MacGillivray, 1886 



CRASPEDOZOUM (?) ELONGATUM, n. sp. 



Plate 3, figs. 6, 7 



Description. — The zoarium is free, unilamellar, the fronds being 

 formed of three longitudinal rows of zooecia. The zooecia are dis- 



