A MONOGRAPH OF THE TERTIARY POLYZOA OP VICTORIA. 29 



I cannot agree with Waters in referring this species to Busk's Salicomaria 

 malvinensis. The zooecia are much elongated and disposed alternately in longitu- 

 dinal series so that they are contiguous end to end, the upper and lower extremities 

 being broad and nearly straight, while in C. malvinensis the zooecia are uniformly 

 broadly hexagonal or rhomboidal, opposite laterally and distant longitudinally, their 

 extremities being pointed. The shape of the zocEcia in this genus is certainly not a 

 very reliable character, being subject to considerable variation in some of the species, 

 but in the numerous specimens I have examined of the present form, and recent 

 C. malvinensis from New Zealand, the arrangement is constant. The avicularia also 

 are not exactly similar, the lower angles of the mandibles in C. malvinensis being 

 sharper and longer. 



4. C. australis, McG. PL III., fig. 19. 



Gellaria fistulosa, var. Australis, McG., P.Z.V., 49 ; C. Australis, McG., 

 T.R.S.V., 1884; C. fistulosa, Waters, Q.J.G.S., 1881, p. 319; Salicomaria clavata, 

 Busk, C.P., Pt. I., p. 88. 



Branches cylindrical. Zooecia contiguous, much elongated; margins raised; 

 surface depressed, granular; thyrostome a little above the middle, lower lip 

 slightly projecting forwards and with two minute denticles. Avicularium occupying 

 a separate area above a zooecium ; mandible broad, directed upwards. Ovarian 

 pores rounded. 



S.P. ; M.C. 



I have some doubt whether this, which is a rare species in the deposits, should 

 be referred to C. australis or G. fistulosa, in both of which the avicularium is of the 

 same character, and which are otherwise closely allied. The former is usually 

 larger and has the secondary branches rising from the sides of the cylinders. In the 

 fossils I cannot see any marks of the lateral branches ; but as C. australis is a 

 common Australian species, while C. fistulosa has not, so far as I know, been found 

 here living, I think it better to refer the present form to the former species. In 

 recent specimens there is no difficulty in the discrimination, especially as the 

 opercula afford very distinctive characters. 



5. C. rigida, McG. PI. III., figs. 20-24. 



Cellaria rigida, McG., P.Z.V., 105 ; Salicomaria simplex, Busk, C.P., Pt. I., 

 883. 



C. perampla, Waters, Q.J.G.S., Jan., 1882, p. 260. 



Branches cylindrical. Zooecia rhomboidal, quadrate, or hexagonal ; contiguous 

 in longitudinal series ; thyrostome in upper third, lower lip with a projecting plate 



