22 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



or crenulated. Tlie spiramen is large (0.20 mm wide) distally tubular, 

 granulated, oblique, oriented proximally. The two frontal avicu- 

 laria are relatively small, triangular, with pivot ; the beak is rounded 

 and united to the thickened proximal portion of the peristome. 

 Mcasurcinents. — 



{]ip = o.22 mm . [L^r^ 1.08-1.17 mm 



Penstomice<; ,^ _ Zooecium-^ , ^r^^^^ 



1 Ip = 0:22-0.2/ mm 1 /^ = 0.63-0.72 mm 



Number of zooecia in 4 mm", 7. 



Occurrence. — Janjukian beds at Flinders and Batesford, Victoria. 



Holotype. — U.S.N.M. nos. 85730, 85731. 



GEPHYROPHORA Busk, 1884 

 GEPHYROPHORA BILAMELLARIA, n. sp. 



Plate 5, fig. 3 



Description. — The zoarium is free, bihunellar ; the fronds are broad 

 and very thick. The zooecia are distinct, separated l)y a salient thread, 

 large, rectangular, somewhat elongated ; the frontal is little convex, 

 almost flat, and formed l)y a granular tremocyst with numerous pores. 

 The apertura is large, oval, with a broad, rounded proximal sinus ; 

 the peristome is thin and very little salient. The ovicell is very large, 

 globular, of the same nature as the frontal. On each side of the 

 apertura there is a large triangular avicularium with pivot, with beak 

 very pointed and oriented obliquely toward the apertural sinus. 



Measurements. — 



nia = o.20 mm . fLs = o.'/0 mm 



Apertures , ^ ^^ Zooecmm<! , 



i I la = 0.20 mm /^ = o.50 mm 



Number of zooecia in 4 mm-, 11. 



Occurrence. — Balcombian beds at Muddy Creek, Victoria. 



Holotype.— V.S.N. M. no. 85723. 



SPIROPORINA Stoliczka, 1864 

 SPIROPORINA TENUIS, n. sp. 



Plate 5, fig. 4 



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

 thin, formed of only four rows of cells. The zooecia are distinct, 

 separated by a very small and very finely crenulated thread, much 

 elongated, subcylindrical ; the frontal is convex, perforated by very 

 small tremopores arranged in linear rows and separated by scattered 

 granulations. The peristomie is little apparent and of variable length. 

 The peristomice is elliptical, transverse, oblique; the peristome is 



