4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



the periphery there are small elliptical cavities equally spaced, ii or 

 12 in number, each containing a small avicularium. The zooecia are 

 distinct, separated by their mural rim, arranged in radial rows, hex- 

 agonal. The mural rim is thin, salient ; the cryptocyst is large, con- 

 cave, deep, smooth ; the opesium is terminal, orbicular, margined by a 

 salient thread. The vibracula are very large, auriform, primoserial. 

 The zooecia are not closed around the apex. 

 Measurements. — 



. r/i = 0.07 mm . rL^ = 0.25-0. 30 mm 



Opesumi-^ , „ /ooecium-^ , 



i 1 lo = 0.0/ mm I /^=: 0.25-0.30 mm 



Occurrenec. — Balcombian beds at Muddy Creek, near Hamilton, 



Victoria. 



Holotype.—V.S.'N.M. no. 85807. 



Family HINCKSINIDAE Canu and Bassler, 1927 



HINCKSINA Norman, 1903 



HINCKSINA UNISERIALIS, n. sp. 



Plate 2, fig. 9 



Description. — The zoarium incrusts bryozoa. The zooecia are ar- 

 ranged in uniserial, ramified branches ; they are large, much elongated, 

 pyriform, and bear proximally a long caudal gymnocyst. The opesium 

 is large, anterior, oval ; the mural rim is salient, beveled, a little en- 

 larged at the base and ornamented with spines. The ovicell is endo- 

 zooecial, rather large, convex, smooth. 



Measurements. — 



. r/AO = 0.40-0.45 mm fL.s'^ 0.55-0.80 mm 



Opesium-^ , ;, Zooecuun-1 , 



^ 1 /o = 0.20-0.25 mm I /.c = 0.35-0.40 mm 



Occurrence. — Janjukian beds at Corio Bay, Geelong, Victoria. 



Holotype.—V.S.^.M. no. 85756. 



Family ALDERINIDAE Canu and Bassler, 1927 



MEMBRANIPORIDRA Canu and Bassler, 1927 



MEMBRANIPORIDRA (?) ASYMMETRICA, n. sp. 



Plate I, fig. 9 



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

 distinct, separated by a very deep furrow, elongated, elliptical ; the 

 gymnocyst almost entirely surrounds the opesium ; it is convex and 

 salient on the lateral parts, concave, deep, and hidden proximally. 

 The mural rim is a thin, sinuous thread bearing a salient, simple, or 



