26 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



salient and bears four inconstant spines. The zooecial avicularium 



is transverse, thin with jMYOt, nonsahent. inconstant. The ovicell is 



unknown. 



McasSKrcmciifs. — 



r//a = 0.1 2 mm ^ . fLc = o.6o mm 

 Aperture-^ , ^^^ Zooecuim-^ , 



^ [/rt = o.i5 mm I /-=i:o.25-o.30 mm 



Number of zooecia in 4 mm", 18-20. 



Occurrence. — Janjukian beds at Rairnsdale, Victoria. 



Cotype.— U.S.N. M. no. 85629. 



CHIASTOSELLA POROSA, n. sp. 



Plate 6, fig. 4 



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

 distinct, separated by a furrow, ogival, wide, often transverse ; the 

 frontal is convex, very porous, with much reduced pleurocyst. The 

 aperture is suborbicular ; the concave poster bears a rounded sinus 

 of little depth ; the peristome is wide, nonsalient, with three or four 

 large spines. The avicularium is placed transversely on the median 

 axis of the zooecium ; it is very long, with pivot, with a beak thinned 

 and placed on a convex, porous chamber. Ovicell unknown. 



Measurements. — 



r//a = 0.16-0.20 mm . fLs = 0.70 mm 



Aperture-< , ^ ^ Zooecunn-<^ , o 



^ I /a =: 0.20-0.22 mm 1 /r = o.8o mm 



Number of zooecia in 4 mm", 12. 



Occurrence. — Balcombian beds at Muddy Creek, Victoria. 



Holotype.—U.S.'N.M. no. 85632. 



CHIASTOSELLA GRANDICELLA, n. sp. 



Plate 6, fig. 3 



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

 distinct, separated by a furrow, very large, ogival, very wide, trans- 

 verse ; the frontal is convex, porous, bordered by three rows of areolar 

 pores leaving only a small frontal pleurocyst. The aperture is large, 

 suborbicular ; the proximal border is very concave with a wide, 

 rounded, rather deep sinus ; the peristome is very thick, nonsalient 

 and provided with four large distal spines. The zooecial avicularium 

 is very large, rather long, with pivot, arranged transversely ; the 

 beak is pointed. Ovicell unknown. 



Measurements.— c 



. f/m = 0.22-0.25 mm „ . rL.c = o.90 mm 



Aperture^ , Zooecuun-^ , o /• 



^ 1 la — 0.22 mm 1 /- = o.8o mm (n- 



regular) 

 Number of zooecia in 4 mm\ 5. 



