46 A MONOGRAPH OF THE TERTIARY POLTZOA OF VICTORIA. 



4. L. biformis, msp. PL XXII., fig. 13. 



Zoarram circular, slightly raised in the centre. Zooecia in regular radiating 

 series, distinct, slightly raised distally ; margins granular, sloping inwards at the 

 sides ; area in outer zooecia entirely open, in the central zooecia largely filled in by 

 a depressed strongly granular calcareous lamina ; vibracularian cells situated at the 

 base of an intercalated series of zooecia between two zooecia of the contiguous 

 rows, elongated, the opening rounded proxinially and expanded distally, with a 

 sharp process projecting inwards from one side. Dorsal surface concave, with 

 radiating ridges, corresponding to the series of zooecia, nodular and with large 

 central pores, separated by narrow raised lines. 



Cape Otway, Mr. Dennant. 



I am indebted to Mr. Dennant for two perfect sj)ecimens of this fine species. 

 In both, the marginal zooecia have the same structure as those of the other species 

 of the genus as here adopted. In all of those, however, occupyiug the central part 

 of the zoarium the front is largely filled in by a granular calcareous layer formed 

 by an overgrowth from the margins. 



5. ? L. angulopora, Tenison Woods. PL VIII., fig. 1. 



? Lunulites angulopora, T. Woods, I.e., p. 7 



I have two small fragments, the position of which is very doubtful, but which 

 may be referable to this species. The larger piece is that figured. It has portions 

 of three rows of quadrate cells distinct throughout their whole thickness. On one 

 aspect (the front) are seen two zooecia, slightly depressed below the margins, the 

 surface being finely granular. The aperture is broadly triangular or sub-trifoliate, 

 the edges distinct and the lower part with a thickened rim ; to one side are two 

 rows of two narrow cells, each cell having a long linear opening down the centre, 

 slightly enlarged below, and with distinct smooth margins. On the other 

 (posterior) aspect, the cells are uniform in three rows, smooth and each having a 

 large opening, wide and slightly arched above, contracting by straight sides to the 

 junction of the middle and lower thirds, where there is on each side a sharp denticle 

 below which the opening again contracts to form a bluntly angular sinus. These 

 are probably avicularian. 



Selenaria, Busk. 



Zoarium more or less orbicular^ convex on the frontal side, plane or concave on 

 the dorsal which is usually radiately grooved. Zooecia broad, expanded, arched 

 above and usually contracted below ; margins thin ; lamina occupying greater part 



