A MONOGRAPH OF THE TERTIARY POLTZOA OE VICTORIA. 101 



nearly straight below, with a broad internal denticle and occasionally an apiculate 

 mucro; on or immediately below the lower lip a small oblique avicularium 

 (frequently absent) ; a few small avicularia with triangular mandibles on the free 

 edge of the zoarium. 



M.C.; B.E. ; C.C. (W.). Living. Australia. 



The avicularium is present in almost all the zooecia of some of the fossils, while 

 in others it is mostly absent as in recent specimens where it is very seldom seen. 

 The surface of recent specimens is covered with a glistening epitheca and the pores 

 are scarcely visible without incineration. It is allied to both Mucronella and 

 Porella, but I think is properly made the type of a distinct genus. 



When describing it in T.R.S.Y. and P.Z.V., I had not recognised its identity 

 with Porella emendata of Waters, whose specific name must take priority over that 

 of Busk. 



Rhynchopora, HincTcs. 



Zoarium encrusting. Thyrostome rounded above, the lower lip straight and 

 entire or with a slight sinus ; an uncinate process on the edge of or within the lower 

 lip, and below it a prominent mucro. 



1. R. bispinosa, Johnston, sp. PL XIII., fig. 16. 



I believe the specimen figured to belong to this very variable species, which 

 occurs living in Europe and Australia. Pull descriptions will be found in B.M.P. 

 and P.Z.V. 



M.C. 



2. R. longirostris, Hincks. PI. XIIL, figs. 17, 18. 



Rhynchopora longirostris, Hincks, A.M.N. H., Aug., 1881 ; McG., P.Z.V., 196 ; 

 R. profunda, McG., T.R.S.V., Oct., 1881, P.Z.V., 196. 



Zooecia large, broadly ovate, frequently with a row of pores on the margins ; 

 surface smooth or in older zooecia granular ; thyrostome wide, loAver lip entire ; an 

 uncinate process becoming developed on one side and a prominent mucro below it. 



M.C. 



The few specimens I have seen seem to be mostly from the growing edges of 

 colonies, and do not shew the fully formed zooecia, none of them having the 

 characteristic large avicularia of the recent specimens, although a few small ones 

 are present. Pull description from recent specimens will be found in P.Z.V. 



