76 A MONOGKAl'lI OF TUE TERTIARY I'OLYZOA OF VICTORIA. 



hollowed .111(1 with a sharp denticle at each angle ; seemingly a minute avicularium 

 on the edge ol" the lower lip. 



B. 



17. L. pach If stoma, n.sp. PI. X., fig. 7. 



Zoarium bilaminate, hranched. Zoa'cia elongated, distinct, separated by 

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

 A\liich ari' siiiooUi ; thyrostome lofty, nearly elliptical, the loAver lip being hollowed, 

 a eoiispicuous denticle on each side about two-thirds down the aperture ; the wbole 

 thyrostome surrounded by a smooth, broad, thickened rim. 



M. 



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



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

 narroAver, margins raised, very calcareous with nunun-ous close round pores ; 

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

 angle on each side. 



B. Growing on L. bairnndulei. 



19. Jj. hairusdalei, Waters. PI. XII., fig. 3. 



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



Zoarium in bilaminate branching lobes. Zofficia much elongated, quadrate at 

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

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

 thyrostome lai'ge, lofty, contracted below tlie middle by a cons2)icuous denticle, 

 loAver lij) straight or slightly hollowed, Avitli 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 zocecia. It has tlien very much the ap])earance of a 

 Porella, from which, hoAvever, 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 monilifcnt, Milne EdAvards, Sur les Escbares fossilcs, p. 1 ; Busk, 

 Crag Polyzoa, p. 68. 



Zocecia much elongated, separated by very narroAV raised lines, a roAV of round 

 pores in a groove Avitliin the margin; central i^art of zocecia raised ; thyrostome 



