A MONOGRAPH OF THE TERTIARY POLYZOA OF VICTORIA. 115 



The specimens, which are badly preserved, do not shew the characters distinctly, 

 but there is no doubt of the identification. A full description of this abundant 

 recent species and its varieties is given in the Prodronius of the Zoology of Victoria. 



10. H. formosa, McG. 



B.formosa, McG., T.R.S.V., 1883 ; P.Z.V., 97. 



Zoarium fenestrate ; fenestrte rounded, narrower than the trabeculte. Zooecia 

 ovate, separated by raised lines; thyrostome sloping backwards, narrower below, the 

 thickened lateral margin uniting at an acute angle with the cell-margin ; the lower 

 lip straight with a minute sinus. 



B. A single specimen. A living Victorian species. 



The specimen does not shew the dorsal avicularia distinctly. On the front of 

 the zooecia, instead of the single avicularium of the recent form, there are several 

 pores which are probably avicularian. The characteristic thyrostome, however, is 

 clearly shewn. 



11. B.jporcellana, McG. (fZ'X^' f( j . O 



B. porcellaua, McG., T.R.S.V., 1869 and 1882 ; P.Z.V., 95. 



Zoarium fenestrate, trabeculte stout. Zooecia rhomboidal or elongated, separated 

 by prominent raised margins terminating at the lower part of the thyrostome ; 

 thyrostome straight or slightly hollowed below, with a small avicularium on the 

 lower lip (in the fossil appearing as a depression or notch) and a spine on each side ; 

 one or two elliptical or linguiform avicularia on the front of the zooecia. Dorsal 

 surface divided into rather large areas by prominent vibices, each area with an 

 avicularium similar to those in front. 



S.P. ; C.B. 



12. B. producta, Busk. 



B. porcellana, var. laj:a, McG., P.Z.V., 95 ; B. 2)roducta, Busk, Chall. P. 



Zoarium reticulate, the branches thick and massive and when anastomosing 

 forming long angular meshes. Zooecia elongated, with narrow raised margins ; 

 thyrostome hollowed below and with a sinus, in the lateral zooecia the peristome 

 produced, especially to the outside, and divided, each division (in recent specimens) 

 bearing a spine ; frequently a small avicularium Ijclow the lower lip and others on 

 the front of the zooecia. Dorsal surface vibicate and with small nodular elevations. 



S.P. ; M.C. ; B. ; C.B. Kccent Australian. 



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