Australian Polyzoa. 139 



The specimens from King's Island and Port Curtis differ 

 in several respects and perhaps ought to be considered as 

 distinct species. In both, the polyzoary is very much con- 

 voluted, thin, cavernous and very brittle. In those from 

 Port Curtis the convolutions are closer, the cells are nearly 

 square, the raised margins separating them thick and strongly 

 crenulated, the calcareous lamina thicker and more granular, 

 and the edge of the oval opening thick and crenulated. In 

 the King's Island specimens, the interstices of the convolu- 

 tions are narrower ; the cells are much more elongated, the 

 raised margins separating them are thin and smooth, the 

 calcareous lamfme very finely granular, and the edges of 

 the elliptical opening smooth and very little or not at all 

 thickened. 



This seems to be the species described asUschara chartacea 

 by Lamarck. It may, especially the Port Curtis variety, be 

 identical with the B. delicatula described by Busk as occurring 

 recent in Australia, and fossil in the Coralline Crag. From 

 this it differs in the absence of the serrated denticle described 

 and figured as occurring in both recent and fossil specimens, 

 and in the greater extent of, the lamina. 



DICTYOPORA, New Genus. 



Polyzoary erect, rigid, expanded, reticulate, attached by a 

 flexible stem. Cells opening on both sides. 



Dictyopora differs from Retepora and Petralia in having 

 the cells opening on both sides, and from Eschara in being 

 fenestrated and attached to a flexible stem. 



The genus Adeona of Lamouroux contains two species 

 A.grisea and A. joliifera, differing chiefly in the former 

 being fenestrated, and the latter entire. A. grisea ought 

 probably to be referred to the present genus. 

 D. cellulose? . 



Polyzoary expanded, cavernous ; fenestras round, small, 

 much narower than the interspaces. Cells distinct ; mouth 

 nearly circular. A large avicularium on the front of each cell 

 below the mouth, mandible pointed obliquely upwards and 

 outwards. 



Queenscliff. 



Of this species I have two specimens which were drawn 

 up on a fishing line. The larger is nine inches high, and 

 at its thickest part sixteen inches in circumference. The 

 polyzoary forms an expanded lamina twisted and united, so 

 as to form large cavernous compartments, mostly extending 



