36 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



four or five rows of proximal ones. In the inner row the areolar pores 

 are small, numerous, and separated by short radial costules. The aper- 

 ture is neatly hippoporif orm ; two long, oblique cardelles, placed low, 

 separate a large orbicular anter from a poster smaller but wider and 

 in which the proximal border is straight or a little convex ; no salient 

 peristome. There is only a single lateral avicularium to a zooecium ; 

 it is placed a little above the transverse, median zooecial axis ; it is small, 

 oval, oblique, with beak oriented exteriorly. 

 Measurements. — • 



fha = o.22 mm ^ . rL.?= 1.10-1.65 mm 

 Aperture-^ , Zooecumi<^ , _^,^^, 



^ ] /a = o.29 mm |^ /^ = o.55-o.05 mm 



Number of zooecia in 4 mm", 6. 



Occurrence. — Janjukian beds at Torquay, 15 miles south of Geelong, 



Victoria (bore no. i at depth of 160 feet). 



Holotype.— U.S. 1<I.M. no. 85754. 



HIPPOMENELLA VERMICULARIS, n. sp. 



Plate 8, fig. 3 



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

 separated by a very deep furrow, elliptical, very short, swollen ; the 

 frontal is very convex and formed by a smooth pleurocyst, surrounded 

 by four or five rows of large areolar pores. The aperture of the ovi- 

 celled zooecia is rectangular, a little transverse, narrowed in the in- 

 ferior third. The proximal border is convex. The ovicell is enormous, 

 globular, embedded in the distal zooecium perforated by large scattered 

 pores and richly decorated by salient vermiform ridges. There are two 

 avicularia symmetrically arranged on the transverse median axis of 

 each zooecium and on the inner line of areolar pores ; they are small, 

 triangular, oblique ; their beak is salient and is oriented exteriorly and 

 proximally. 



Measurements. — 



. r//a = o. 1 5-0.20 mm ^ . rL.s = 0.7 5 mm 



Aperture^ , ZooecmmH ; 



1 /a = o.2i mm 1 ls = o.i^ mm 



(Ovicelled zooecia) 



Number of zooecia in i mm^ 3. 



Occurrence. — Balcombian beds at Muddy Creek, Victoria. 



Holotype.— U.S. '^.M. no. 85752. 



HIPPOPORELLA Canu, 19 17 

 HIPPOPORELLA TESTU, n. sp. 



Plate 8, fig. 4 

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

 separated by a deep furrow, large, elongated ; the frontal is very 



