A MONOGRAPH OF THE TERTIARY POLYZOA OF VICTORIA. 25 



front of the zocecia. Vibracula large, on the back of the branches, biserial, each 

 common to several zooecia. 



1. C. grandis, Hincks. PI. III., fig. 9. 



Caberea grandis, Hincks, A.M.N.H., July, 1881, McG., P.Z.V., 136. 



Branches rather broad, lignlate. Zooecia multiserial ; aperture large, oblong, 

 two spines on the outer and one on the inner angle of the marginal zooecia ; one 

 spine at each upper angle of the central ; a short clavate scutum on a thick pedicle 

 projecting over the aperture; a minute avicularium on the anterior edge of the 

 outer margin of the lateral zooecia ; one or two avicularia at the base of the other 

 zooecia. Ooecia flat, mitriform, with a thickened rim. Dorsal surface entirely 

 obscured by the vibracular cells which are distinct, almond-shaped, those of opposite 

 sides meeting in a groove in the centre. 



M.C.; B.; M. Living. Australia. 



Some of the specimens distinctly show the various characters given. None, 

 however, have the large vicarious avicularia usually seen in recent specimens. 



2. O. darioinii, Busk. PL III., figs. 10, 11. 



Caberea darioinii, Busk, C.P., Pt. I., p. 29 ; MacGillivray, P.Z.V., 137. 



Branches rather narrow. Zooecia biserial, elongated ; area large, partly filled 

 in by a granulated expansion with a thickened crenulated margin ; aperture 

 elliptical, over-arched by a rather large scutum ; one or two spines at the upper and 

 outer angle. A small avicularium on the outside of each lateral zocecium, and a 

 sessile avicularium at the base of each peduncular spine. Posteriorly vibracular 

 cells much elongated, fusiform. Ooecia smooth. 



M.C. Recent Australia, New Zealand and Southern Ocean. 



Canda, Lamouroux. 



Zoarium dichotomously branched ; branches articulated, connected also by 

 transverse chitinous tubes attached at either end to a vibraculum. Avicularia 

 large, situated on a special tract on the front of the branches, between the rows of 

 zooecia. Each zooecium with a vibraculum posteriorly. 



1. C. fossilis, Waters. PL III., figs. 12, 13, 14. 



C. fossilis, Waters, Q.J.G.S., 1881, p. 322. 



Branches narrow. Zooecia biserial, elongated ; upper extremity recedent, with 

 a short, sharp process at the angles where it turns back ; aperture extending three- 



E 



