12 A JIONOGHAni OF Till': TERTIARY POLYZOA OP VICTORIA. 



with vcr}- large supra- aiul iut'ra-avicularian cliaiiibers or depressions; occasionally a 

 second (pedal) chamber below the last. Posterior surface convex or carinate. 

 S.P. ; M.C. ; B. A living Australian species. 



11. C. crux, n..sp. PI. I,, fig. 18. 



Zooecium nearly quadrate, naiiowtnl above and with a long narrow prolongation 

 lu'low ; a depressed ari'a with six small tenestra3 ; thyrostome small, straight or 

 slightly hnllowed and entire below, and with a minute denticle on each side; a long, 

 narrow avicularian chamber on each side, supporting a minute avieulariuni ; a large 

 supra- and a rather .smaller inTra-avicularian chamber; a long, narrow depression 

 on each side of the infijrior stem-like prolongation. i'osteriorly, the inferior 

 prolongation sharply convex, the convexity ending above in a prominent umbo. 



S.P. ; M.C. 



Allied to the recent C. cariudhi and also to C (data and oloiigata. 



12. C. porosfi, n.sp. PI. I., fig. 19. 



Of this I have only the single fragment figured, so that a full description is 

 impossible. I have no doubt, however, that it is a good species. It presents an 

 unusual arrangement in the true Catenicellai in the occcium being fixed on the front 

 of a cell in a .series instead of being terminal. The ordinary thyro.stome is small, 

 arched above, slightly hollowed and entire below, and with a minute denticle on 

 each side. The aperture of the fertile zocecium and ooecium is very wide, semihuiai-, 

 the angles very sharp, and the lower margin with a large rounded sinus. There are 

 several fenestr?e on the front of the zooecium of which enough, however, is not 

 preserved to show their number and arrangement ; and at the side immediately 

 below the th3'rostome there seems to ha\e been a large anterior aviculaiium. The 

 ooecium is large, nearly flat and slightly prominent, surrounded by a thick, raised, 

 smooth band enclosing a nearly circular, minutely-perforated area. The posterior 

 surface is rounded and smooth. 



M.C. 



13. C. ci'ihraria, Bu.sk. PI. I., fig. 20. 



C. cribraria, Bu.sk, B.M.C., P. I., 9 ; /(/. C.P., p. 11 ; McG., P.Z.V., 24. 



Zowcia broadly ovate ; lateral processes of moderate size, with an avieulariuni 

 opening outwards ; anterior surface convex with an outer row of moderate-sized 

 elliptical fenestra; and numerous smaller internal ones ; thyrostome large^ lower 

 margin slightly convex upwards. Posterior surface smooth. 



S.P. ; M.C; B. ; M. Living, Australia. 



