34 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



by a large number of very small pores. The ascopore is transverse, 

 elliptical or crescentric, salient and almost adjacent to the aperture. 

 The aperture is semielliptical with a straight, transverse, proximal 

 border ; the peristome is distal, salient, thick, ornamented with several 

 flat, short spines. The avicularium is lateral, large, transverse, tri- 

 angular, with beak pointed and oriented exteriorly, placed at the 

 side or a little below the ascopore ; it surmounts a triangular chamber, 

 salient, convex, covered by tremopores. The ovicell is hyperstomial, 

 closed by the operculum, large, globular, of the same nature as the 

 frontal. 



Measurements. — 



( ha = o.oy mm . rLr = 0.55 mm 



Apertures , ^ Zooecia^ , ^^ 



^ I /a = 0.1 5 mm I /.:;? = 0.40-0.55 mm 



Number of zooecia in 4 mm^ 16. 



Occurrence. — Balcombian beds at Muddy Creek, Victoria. 



Holotype.—V.S.^.M. no. 85791. 



FENESTRULINA JuUien, 1888 



FENESTRULINA PRAETEXTA, n. sp. 



Plate 9, fig. II 



Description. — The zoarium is free, bilamellar, bifurcated; the 

 fronds are narrow and flabellate. The zooecia are distinct, bordered 

 by a thin thread surmounting a large salient smooth cushion, triangu- 

 lar in section, much elongated, rectangular somewhat narrowed be- 

 hind ; the frontal is little convex, bordered laterally by areolar pores 

 and proximally with some tremopores ; it bears on the longitudinal 

 axis a large orbicular or crescentric ascopore much removed from 

 the aperture. The aperture is semielliptical, transverse, the poster 

 being simply concave. Ovicell unknown. 



M easnrements .— 



[ha = o.OQ mm . fL^'^ 0.80 mm 



Aperture<^ , Zooecium-^ , ^^ 



^ I /a = 0.1 3 mm 1 /.c = 0.36-0.40 mm 



Number of zooecia in 4 turn, 18. 



Occurrence. — Janjukian beds at Flinders, Victoria. 



Holotype.— U.S.N. M. no. 85720. 



Subfamily Hippoporae Canu and Bassler, 191 7 

 HIPPOMENELLA Canu and Bassler, 19 17 

 HIPPOMENELLA PARVIPOROSA, n. sp. 



Plate 7, fig. 2 



Description. — The zoarium is unilamellar and attached to frag- 

 ments of bryozoa. The zooecia are distinct, separated by a rather deep 



