A MONOGRAPU OF THE TERTIARY POLYZOA OF VICTORIA. 117 



17. H. Impar, ri.sp. 



Zoarmm thick ; fcnestrtc small, elliptical, about the same width as or rather 

 narrower than the traheeiikc. Zofficia indistinct, smooth or very finely granular; 

 thyrostome rounded, within the lower edge a plate with a sinus (frequently bridged _ 



over) to one side, and with a prominent avicularium on the larger side; frequently , .^^■^^'^'^''^'f?:;^,^. 

 an avicularium Avith a long narrow mandible directed obliquely or transversely and.''-' . -. _v / 

 situated on a wide, much-raised elevation on the front of the zoa3cium below the ^>-1ifti,ia3^-' 

 thyrostome. Dorsal surface smooth or minutely granular, divided by faint vibices 

 into elongated spaces with numerous small round pores (probably avicularian). 



B. 



Allied to the living R. aurantiaca. 



18. B. lineata, n.sp. PL XV., fig. 6. 



Zoarium thick ; fenestrse small, elongated, elliptical, about half as wide as the 

 trabeculsB. Zocecia very irrcg ular in shape and arrangement, traversed by numerous 

 irregular sinuous raised lines ; surface smooth and with a few small pores ; thyro- 

 stome rounded and much depressed above, a distinct rounded sinus in the lower lip, 

 with the angles produced upwards on each side into a prominent acicular spine, and 

 having occasionally a smaller spine external to it ; numerous scattered, rather large, 

 broadly linguiform avicularia, sessile, subimmersed or slightly raised. Dorsal surface 

 smooth, divided into angular spaces by strongly-marked sharp vibices, with a few 

 rounded pores, seemingly avicularian, and mostly one in each space. 



S.P. 



19. £,. granulata, McGr. 



B. (jmnulata, McG., P.Z.V., 99. 



Zoarium fenestrate ; trabecuhe broad, nearly fiat in front. Zocecia indistinctly 

 separated, surface finely granular; thyrostome subcircular, or with the lower lip 

 straightened ; a depression on the edge of the lower lip, with a rounded or elliptical 

 avicularium on one side and a small sinus on the other ; small immersed round 

 avicularia on the front of the zoo3cia. Dorsal surface, with a few not very prominent 

 vibices, granular ; numerous immersed circular avicularia. 



S.P. Recent Australian. 



I have only the single fragment. It is much less strongly granular than is 

 usual in recent specimens. The divisions between the zooecia are almost obliterated, 

 as are also the dorsal vibices. The arrangement about the thyrostome varies a good 



