NO. 9 TERTIARY ERYOZOA CANU AND BASSI.ER 2"] 



Occurrence. — Balcombian beds at Muddy Creek, Victoria, 

 //o/o^'/'c.— U.S.N.M. no. 85628. 



CHIASTOSELLA PARVIPOROSA, n. sp. 



Plate 6, fig. 10 



Description. — The zoarium is unilamellar. The zooecia are distinct, 

 separated by a deep furrow, very large, ogival, little elongated, wide ; 

 the frontal is convex, covered with relatively small pores, without 

 pleurocyst. The aperture, transverse and semielliptical in aspect, bears 

 on its concave proximal border a small rounded sinus ; the peristome 

 is very thick, nonsalient, garnished with four large hollow spines. 

 Ovicell unknown. The avicularium is large, transverse, borne on a 

 large porous convex chamber ; the beak is rather pointed ; its base is 

 placed on the first row of pores. 



Measurements. — 



r/;ar = o.28 mm rL.c = 0.50-0.60 mm 



Aperture-^ , ^ Zooecium-< , ^ ^^ ^ ^^ 



^ I /c = 0.25-0.27 mm I /.:r = 0.50-0.55 mm 



(without avicularium) 



Number of zooecia in 4 mm', 5. 



Occurrence. — Janjukian beds at Flinders, Victoria. 



Holofype. — U.S.N.M. no. 85627. 



EMBALLOTHECA Levinsen, 1909 

 EMBALLOTHECA INCLINATA, n. sp. 



Plate 6, fig. 6 



Description. — The zoarium is bilamellaf, with broad fronds. The 

 zooecia are distinct, separated by a white nonsalient thread ; the frontal 

 is flat, perforated by large polygonal, expanded tremopores, rectangu- 

 lar and somewhat elongated. The aperture is semielliptical, transverse ; 

 the proximal border bears a semicylindrical mucron, inclined in the 

 apertiu'e ; two small lateral cardelles are placed at the level of the 

 distal border of the mucron ; the peristome is incomplete, wide, smooth, 

 nonsalient. The ovicells are enormous, embedded in the distal zo- 

 oecium, very convex and salient, covered with large pores. The ovi- 

 celled zooecia are wider; their aperture is large (0.20 by 0.25 mm) 

 and ornamented with two large cardelles ; the peristomice is setni- 

 elliptical, transverse. 



Measurements. — 



r/;(; = 0.io mm rL.cr = 0.60-0.70 mm 



x^perturei , ,^^ r Zooecumi-< , ^^ .^ „ ^^ 



i I /a = 0.15-0.16 mm I /.:: = 0.40-0.50 mm 



Occurrence. — Balcombian beds at Muddy Creek, Victoria. 



Holotype. — U.S.N.M. no. 85701. 



