100 A MONOGRAPH OF THE TERTIARY POLYZOA OF VICTORIA. 



species. The zooecia are large, elongated, convex, granular and porous ; tlie 

 thyrostome is large, wide, arched above, contracted below; peristome thickened on 

 the sides and below, and raised in the centre into a thick pointed mucro, on one 

 side of which is a large aviculariuni. 



M. 



6. M. mooraboolensis, n.sp. PL XIII., fig. 9. 



Zoariuni encrusting. Zooecia irregularly arranged, ovate, distinct, prominent, 

 especially above ; tliyrostome large, arched above, lower lip straight and without a 

 sinus, with growth projecting forwards so as to form a broad rounded mucro ; 6-8 

 spines on the upper lip ; a vibracular pore on an elevation on one or both sides of 

 the thyrostome. 



M. 



I am doubtful where to refer this species. The vibraculutn is similar to that 

 of Mastigopliora, but there is no sinus. 



7. M. apiculata, n.sp. PI. XIII. , fig. 5. 



Zoariuni encrusting. Zocecia elongated, distinct convex, surface with small 

 pores ; tliyrostome rounded above, slightly hollowed below with a sharp mucro 

 from immediately below the lower lip, projecting upwards and forwards and with 

 an avicularium on one side. Ocecia large, rounded, prominent. 



B. 



Allied to M. porosa, Hincks. 



Bracebridgia, McG. 



Zoariuni bilaminate, erect. Tliyrostome subcircular, straighter below, with an 

 internal denticle; peristome thickened, smooth or with a small apiculate muco; 

 frequently in the fossils, but rarely in recent specimens, a triangular aviculariuni 

 immediately below the loAver lip ; lateral avicularia on the free edges of the 

 zoariuni. 



1. P. emendata, Waters, sp. PI. XIII. , figs. 10, 11. 



Porella emendata, Waters, Q.J.G.S., 1881, p. 336 ; Mucronella pyriformis, 

 Busk, C.P., Pt. I., 155; Bracebridgia pyriformis, McG., P.Z.A r ., 158. 



Zoariuni forming branching lobes. Zooecia expanded above, narrowed below, 

 a row of pores iu a furrow down each side and occasionally others on the front; 

 a tumid band embracing the upper part of the tliyrostome, the two sides uniting 

 bolow the lower lij) and continuing downwards as a central elevation; thyrostome 



