NO. 9 TERTIARY BRYOZOA CANU AND BASSLER 1 5 



tinct, separated by a common mural rim, very long, ogival, a little 

 narrowed proximally. The mural rim is thick, salient, rounded ; the 

 cryptocyst is very large, deep, concave, smooth ; the opesium is ter- 

 minal, elongated, elliptical, very finely crenulated. The zooecia of 

 the median rows alone bear a large avicularian chamber ; it is placed 

 on the proximal cryptocyst where it occupies half of the length ; it 

 is rectangular and convex ; the avicularium is median, small, salient, 

 triangular, with the beak oriented proximally. The noncellular face 

 of the fronds shows the limits of the lateral zooecia and their out- 

 lines without any apparent relation to the series of median zooecia. 

 Measurements: — ■ 



. f/; = 0.35-0.40 mm . (Lz=iA'^ mm 



Opesumi-^ , ^ Zooecia -< , 



^ y to = 0.2c, mm 1 /- = o.45 mm 



Occurrence. — Balcombian beds at Muddy Creek, Victoria. 



Cotypes.— U.S.N. M. no. 85721. 



Suborder Ascophora Levinsen, 1909 



Family CRIBRILINIDAE Hincks, 1880 



CRIBRILINA Gray, 1848 



CRIBRILINA CRASSICOLLIS, n. sp. 



Plate I, fig. 7 



Description. — The zoarium is free, cylindrical, bifurcated, formed 

 of four or five longitudinal rows of zooecia. The zooecia are distinct, 

 separated by a furrow (when young), elongated, elliptical. A thick 

 secondary calcification fills up the separating furrow joining together 

 adjacent mural rims and surrounding the zooecium and the aperture. 

 The frontal is convex, perforated by large lacunae arranged in quin- 

 cunx. The apertural bar was rapidly covered with secondary calcifica- 

 tion to form a thick peristome. The aperture is terminal, semielliptical, 

 transverse, with a concave proximal border. Two small avicularia 

 are arranged symmetrically on each side of the aperture. 



Measurements. — 



r/u7. = o.io mm ^ . (Ls = o.6^ mm 

 Aperture-^ , ^ ^q Zooecia-^ , 



^ [/a = 0.1 8 mm ] L — 0.4S mm 



Occurrence. — Balcoml)ian beds at Muddy Creek, and Janjukian beds 



at Batesford, Victoria. 



Cotypes.—U.S.N.M. nos. 85664, 85665. 



