8 



high and broad), irregularly pentagonal ; in older specimens 

 (twice the above dimensions) irregularly lobed or sinuated. 

 Zoooecia small round projecting and irregularly pitted, or 

 porous. Mouth circular with a raised margin. Vibraeular 

 pore oblique, pyriform with a raised margin, and a conspicuous 

 bar across the centre. Under surface finely radiately ridged, 

 with a long narrow slit-like pore at the margin. 



Locality and Horizon. — Grlauconitic limestone, Aldinga (Prof. 

 Tate). I have also found the same species in the lower lime- 

 stone beds at Mount G-ambier. It is decidedly the largest 

 species known, and is easily distinguished by its peculiar vibra- 

 cular orifice. 



LUNULITES EXIGTTA, Spec. 1WV. 



PI. II., fig. 7a— 7c. 



Zoarium very small, thin scale-like, slightly convex, but 

 depressed. Zoooecia minute in regular radiating, sometimes 

 bifurcating, raised rounded lines. Mouth circular, large. 

 Avicular cells in grooves between the lines of cells, lanceolate. 

 Base quite concave, with lines of projections exactly corres- 

 ponding with the zoooecia and avicular cells. 



This species somewhat resembles the following L. cupola in 

 the disposal of its cells and the avicularia, but it has a concave 

 base, and the shape of both zoarium and zoooecia are different. 



Locality and Horizon. — White polyzoal limestones at Mount 

 Gambier (Prof. Tate). 



LUNTJLITES CUPOLA, Spec. 110V. 



PI. I., fig. 5a— 5c. 



Zoarium small, nearly circular, roundly conical. Zoooecia 

 oval, flat round the margin, and regularly convex in the centre. 

 Mouth in the lower part neatly defined, horseshoe shaped, with 

 two small shifting oval protuberances on each side ; whole sur- 

 face finely granular, edges overlapping the avicular grooves. 

 Avicular pores parallel with the base of the cells, smaller 

 than the apertures, elongately oval with a basal groove and 

 two small processes projecting from the sides, so as to con- 

 strict the centre of the orifice, Base of zoarium quite flat, 

 granular irregularly marked with grooves, which bifurcate at 

 the edges, on which there are conical shaped hollows corres- 

 ponding to half a cell area. 



Locality and Horizon. — Muddy Creek Miocene beds, near 

 Hamilton, Victoria. 



Genus Selenaeia, Busk. 

 Only a certain number of cells, dispersed throughout the 

 polyzoary, furnished with vibracula. The front of each cell 



