26 A MONOGRArH OF THE TERTIARY POLTZOA OF VICTORIA. 



fourths of the length of the zoopcium, wide above, narrowed l)elow ; margin 

 (including sometimes the whole anterior surface) crenulated and finely granular; a 

 sessile avicularium at the inner side opposite the middle of the aperture. Ocecia 

 glolnxlar, sub-immersed, turned towards the mesian line, surmounted by an 

 avicularium. Posteriorly the outline of zooecia oblique ; the vibracular cells 

 extending slightly beyond the niesiau line. BeloAv the vibracula a large pore for 

 the attachment of a radical tu1)e. 



M.C. ; B.R. ; M. ; W.P. and C.C. (W.) 



Of this species there are two varieties. In the one, tliat figured by Waters, the 

 aperture is very narrow and pointed below ; while in the other (f^i:^. 11) it does not 

 extend so far down, and is rounded and not so narrow. 



2. C. inormis, n.sp. PI. III., fig. 15. 



Branches narrow. Zooecia biserial, elongated ; aperture occupying three- 

 fourths of the front, with raised, linely-creniilated margins, the upper end sliglitly 

 retrocedent, but with no spines at the angles. No avicularia. Posteriorly the 

 outline of the zorecia as in front, the vibracular cells with the groove extending 

 beyond the mesian line. 



M.C. 



Of this I have only the fragment figured. It has a considerable resemblance to 

 the recent C. friniis (McG.), but differs in the total absence of avicularia. It is 

 possible, however, that other specimens may show them. Prom C. fossilis it differs 

 in the form of the aperture, the absence of the superior spines, and of the internal 

 avicularia. 



Plicopora, n.g. 



Zoarium in linear, uniserial, articulated branches, each internode consisting of 

 a single zocecium. Zooecia broad, thick, greater part of the front oecujiied by an 

 elliptical aperture surrounded by a plicated ridge. 



1. P. (hjcdala, n.sp. PL IV., fig. 4. 



Zooecia broad below, nai'row and rounded above; aperture occupying the greater 

 part of the front, the margin thickened and smooth, surrounded by a narrow 

 plicated ridge ; a small round pore below the aperture and close to the ridge. 

 Posterior surface smooth, with on each side at the base an elevated grooved ridge 

 turning upwards and outwards by a sharp angle towards the middle ; towards the 

 upper part is a large rounded opening, possibly for a radical tube. On each lateral 

 edge of the zocecium inferiorly is a small, elliptical, immersed avicularium. 



S.P.; only two separate zooecia seen. 



