A MONOGRAPH OF THE TERTIARY POLYZOA OF VICTORIA. 67 



tomoses of the ridges. Seen from behind, the zoa'cia are much elongated, narrow ; 

 the thyrostome is rounded above, straight below, and there is the opening of a 

 zoo3cial pore, sometimes of considerable size, at other times quite small. 



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



Judging from the very impcn-fect description and iigure given by Mr. Woods, 

 I cannot see any reason for identifying this with his J^schara elccala, and I therefore 

 quote Waters as the authority for the name. ( 



Adeona, Lamouroiix. 



Zoarium rarely encrusting, usually erect and bilaminate, entire or fenestrate. 

 Zoo3cia with the thyrostome subcircular or straight below ; zowcial i)ores single or 

 clustered. In addition to the ordinary sessile avicularia usually found in the 

 neighbourhood of the thyrostome and on other jjarts of th(; zoo3cium, are other 

 larger avicularia on special cells. Oojcia internal, consisting of modified zooecia 

 (gonoecia of Hincks.) 



In this genus there are two groups of species, the one containing the Adeoiue of 

 Lamom'oux, being attached by a slightly flexible stem composed of a mass of radical 

 tubes more or less calcified, the other, for Avhich I have previously proposed a genus 

 Adeoiiellopsis, having the zoarium attached by a rigid base. The species of the 

 former group are all, with the exce^jtion oi A. foliacea (Lamx.), fenestrate, Avhile in 

 the latter the zoarium is continuous and branched or lobed. The difference in the 

 mode of attachment is perhaps scarcely of generic value, and I therefore now 

 combine both groups as sections of the one genus. 



*Zoarium attached by a flexible stem, composed of partially calcified radical 

 tubes. 



{Adeona, Lamouroux.) 



1. A. (jrisea, Lamx. PI. IX., fig. 5. 



Adeona grisea, Lamx., P.C.F., Ibl ; Kircheupauer, Ueber die Adeona, 9; 

 McG., C.V. ; Dictyopora griisca, McG., P.Z.Y., 60; M'wroporella grisea, form 

 Adeona, Waters, Q.J.G.S., 1885, \). 2yj<. 



Zoarium expanded, erect, bilaminate, fenestrate ; edges of fenestrse bordered by 

 large, rounded, pitted or granular nodules. Zorecia ovate, surface pitted ; thyrostome 

 subcircular ; a small, deej) pit in the centre of the zoteciimi, from which a short, 

 rather broad, avicularium extends obliquely upwards and outwards, the point 

 reaching to immediately below the thyrostome to one side. 



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