68 A MONOGRAPH OP THE TERTIARY POLYZOA OP VICTORIA. 



S.P. ; M.C. Living. Australia. 



Var. interdigitata, fig. 6. Zooecia irregular in shape, separated by sinuous 

 divisions, the lobes or processes from contiguous zooecia frequently interdigitating. 

 S.P. 



2. A. cellulosa, McG. PL IX., fig. 4. 



Dictyopora cellulosa, McG., P.Z.V., 47 ; Adeona cellulosa, Kirchenpauer, Ueber 



die Adeona, 10 ; McG., O.V. ; Microporella cellulosa, form Adeona, Waters, 

 Q.J.G.S., 1883, p. 437. 



Zoarium expanded, bilaminate, fenestrate, proliferous and cavernous (recent 

 specimens) ; edges of the fenestra with pitted or granular nodules. A large 

 avicularium in front, with the mandible long, directed upwards and outwards, and 

 reaching half-way up the side of the thyrostome. 



S.P. Living. Australia. 



One or two imperfect fragments seem referable to this species. 



A. grisea and cellulosa are very closely allied. The only difference in the zooecia 

 is that in the former the avicularian mandibles are shorter and do not extend up the 

 side of the thyrostome as they do in the latter. The fossil specimens are only small 

 fragments, and do not shew the structure of the zoarium. This, however, in recent 

 specimens is so different in the two forms that in my opinion they must be considered 

 to be specifically distinct. In A. grisea the zoarium is broad, nabellifomi and flat, 

 not convoluted, and in all the specimens I have seen consists of a single plate. 

 Kirchenpauer, however, says that it is sometimes proliferous. In A. cellulosa it is 

 much larger, proliferous, and forming large cavernous cells. The colour, which in 

 this genus is a character of some value, is dark grey or nearly black in the former, 

 while in the latter it is brown, of a rather light tint. 



**Zoarium attached by a rigid base. 



{Adeonellopsis, McG.) 



3. A. obliqua, n.sp. PI. IX., figs. 7-11. 



Microporella violacea, var.Jissa, Waters, Q.J.G.S., 1881, p. 329. 



Zoarium erect, bilaminate, divided into flat lobes. Zooecia arranged in oblique 

 series directed from the centre outwards on either side, ovate ; surface round the 

 margins punctured ; a depression in the centre, with a small pore (trypa), which is 

 seen posteriorly as a linear denticulate fissure ; an elevation on one or occasionally 

 on both sides (one then not so conspicuous) below the thyrostome; thyrostome 



