90 A MONOGRAPH OF THE TERTIARY POLTZOA OF VICTORIA. 



Adoonolla, J]iisk. 



1. A. friton, n.sp. PL IX., fig. 23. 



Zooecia largo, imicli olongatod, distinct; surface smooth, witli a row of large 

 pores round the margin and extending above the thyrostome ; thyrostome very 

 lofty, arched above, narrowed downwards and liollowed below ; an avicularium with 

 long narrow mandible on one or both sides below the tliyrostome, directed upAvards 

 and reaching to about the middle of its side. Ocecial cells very large ; sides 

 l)ordered by ^ I'ow of very large pores ; a slightly elevated area about the middh^ ol' 

 the cell, with five or six pits or pores ; aperture very wide, peristouK^ very thin and 

 raised, upper lip arelied, lower projecting upwards ; a narrow raised ridge or keel 

 extending vertically from the middle of the lower lip to the ])erf()rated area ; an 

 avicularium on either side b(dow the tliyrostome directed slightly inwards and 

 reaching nearly to the lower lip. 



M.C. 



The systematic position of this very peculiar sjiecies admits of great douljt. Its 

 whole aspect closely resembles Adeonellopsis, with whicli it agrees in the structure 

 and situation of the avicularia and of the large ooecial cells. The ordinary zorecia, 

 however, have no zooccial pore or cluster of pores, and the cluster of pores or pits 

 on the oa3cial cell is raised and the pores themselves not stellate. The shape of the 

 thyrostome also is diffei-ent. On the whole, I think it ought to be referred to the 

 Eschari(Ue, from the other genera of which it is difi'erentiated by the ocecia being 

 internal in modified cells, in the same way as Adcona and iVdeoiudlopsis difl'er from 

 the other Microporellidoe. I have only seen tlie one specimen. 



Family Smittiid^. 



Zoarium crustaceous, or erect and uni- or bilaminate or dendroid. Zoa>cia 

 entirely calcareous, witliout nieinl)raiious lamina or special pores; thyrostome 

 variously shaped, entire (RJiynchopora) with a simis below; a special development 

 of \ho pei'istome forming the secondary orifice. Ocecia external. 



Porella, Gray. 



ZocEcia with the thyrostome subcircular ; secondary orifice horseshoe-shaped or 

 inversely triangular, witli an avicularium within or on the edge of the peristome 

 below. 



1. P. concinna, Busk, sp. PI. XII., figs. 6, 7. 



LepraUa conc/mia, 13usk, B.M.C., II., p. G7 ; Porella concinna, Ilincks, 

 B.M.P., 323. 



