76 A MONOGRAPH OF THE TERTIARY POLYZOA OP VICTORIA. 



hollowed and with a sharp denticle at each angle ; seemingly a minute avicularium 

 on the edge of the lower lip. 



B. 



17. L. pachy stoma, n.sp. PL X., fig. 7. 



Zoariurn bilaminate, branched. Zooecia elongated, distinct, separated by 

 narrow, faint, raised lines ; surface with numerous pores, larger towards the edges, 

 which are smooth ; thyrostome lofty, nearly elliptical, the lower lip being hollowed, 

 a conspicuous denticle on each side about two-thirds down the aperture ; the whole 

 thyrostome surrounded by a smooth, broad, thickened rim. 



M. 



18. L. vagans, n.sp. PL X., fig. 22. 



Zooecia irregularly arranged in spreading clusters, broadly ovate or longer and 

 narrower, margins raised, very calcareous with numerous close round pores ; 

 thyrostome lofty, straight or slightly hollowed below, a stout denticle above the 

 angle on each side. 



B. GroAving on L. bairnsdalei. 



19. L. bairnsdalei, Waters. PL XII., fig. 3. 



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



Zoariurn in bilaminate branching lobes. Zooecia much elongated, quadrate at 

 the ends, distinct, margins thick and raised ; large areolae or pores round the margins 

 and other smaller pores on the rest of the surface which is very calcareous ; 

 thyrostome large, lofty, contracted below the middle by a conspicuous denticle, 

 lower lip straight or slightly hollowed, with a considerable rounded avicularium 

 (frequently absent) in the depression immediately below the lower lip. 



B. 



In some specimens the suboral avicularium is a conspicuous feature, being 

 present in almost all the zooecia. It has then very much the appearance of a 

 Porella, from which, however, it differs in the absence of a median denticle or 

 lyrula. In most specimens the avicularia are absent, or occur only very rarely. 



20. L. monilifera, Milne Edwards, sp. PL XIV., fig 28. 



Eschara monilifera, Milne Edwards, Sur les Eschares fossiles, p. 1 ; Busk, 

 Crag Polyzoa, p. 68. 



Zooecia much elongated, separated by very narrow raised lines, a row of round 

 pores in a groove within the margin ; central part of zooecia raised ; thyrostome 



