A MONOGRAPH OF THE TERTIARY POLYZOA OP VICTORIA. 77 



arclied above, higher than wide, wider below, lower lip hollowed, with an internal 

 denticle on each side ; peristome thickened, with a small avicularium on one or 

 both sides having the mandible directed upwards and inwards. 



M.O. 



The only specimen I have seen is the fragment figured, which is in a single 

 layer with the backs of the zooecia broken away. They are, however, perfect in 

 front and precisely agree with the description and figure given by Milne Edwards. 



21. L. corrugata, Waters. PL X., fig. 26, PI. XIV., fig. 27. 



Lepralia corrugata, Waters, Q.J.G.S., 1881, p. 335. 



Zoarium encrusting or in bilaminate lobes or branches. Zooecia usually much 

 elongated, convex, surface with short longitudinal ridges and a variable number of 

 pores in the intervening furrows ; upper part of zocecium immediately below the 

 thyrostome produced forwards into a large smooth mucro-like elevation with a large 

 avicularium on one side and occasionally other smaller avicularia ; thyrostome large, 

 semicircular, straight below, with a sharp denticle above each angle ; 5-8 spines 

 round the upper margin ; a small rounded avicularium usually near each angle of 

 the thyrostome, and occasionally others scattered over the zoarium, especially in the 

 depression between the zooecia. 



S.P.; M.C. ; B. ; C.B. ; L.B. ; C.C. (W.). 



The most characteristic feature of this species is the development of the 

 mucroid elevation of the zooecium below the thyrostome. In one form this is not 

 so large, and the aperture consequently is not obscured, the denticles being visible 

 on both sides. It may be called variety lata. In another var., apiculata, the 

 zooecia are narrower, the processes much developed, the apex produced into a tube 

 bearing on its summit a small avicularium ; on the outer side is a very long rather 

 narrow avicularium occupying the whole side. The depth of the furrows between 

 the ridges, the number of pores and the number and situation of the small avicularia 

 vary a good deal. At first sight it bears a considerable resemblance to Palmi- 

 cellaria, but the mucroid process is really the upper part of the zooecium and the 

 thyrostome is essentially Lepralian. 



22. L. gippslandii, Waters. PI. X., fig. 21. 



Lepralia gippslandii, Waters, Q.J.G.S., 1882, p. 509. 



Zooecia ovate, convex, distinct, with numerous small indistinct pores ; thyros- 

 tome small, semicircular. " Ooecia globose, punctate," Waters. 



B., on L. baimsdalei. 



