A MONOGRAPH OF THE TERTIARY POLYZOA OP VICTORIA. 117 



17. R. impar, n.sp. 



Zoarium tliick; fenestra small, elliptical, about the same width as or rather 

 narrower than the trabecule. Zooecia 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 

 an avicularium with a long narrow mandible directed obliquely or transversely and 

 situated on a wide, much-raised elevation on the front of the zooecium below the 

 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. R. lineata, n.sp. PL XV., fig. 5. 



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

 trabecule. Zooecia very irreg 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. R. granulata, McG. 



R. granulata, McG., P.Z.V., 99. 



Zoarium fenestrate ; trabecular broad, nearly flat in front. Zooecia 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 zooecia. 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 



