42 ON SOME POLYZOA FROM THE QUEENSLAND COAST, 



radial — surrounded by a prominent margin — especially prominent 

 in the outermost row of cells. Large, sessile, sub -triangular 

 avicularia situated between the rows of cells, and at irregular 

 intervals shallow circular depressions, (vibracular pits) at the 

 bottom of each of which is a narrow semilunar slit, with the 

 concavity directed outwards. Under surface of the zoarium flat, 

 perforated by close-set circular pores, each occupied, either at the 

 surface or at a varying depth, by a thin, translucent covering, 

 perforated by several minute porules, usually with a rather larger 

 one in the centre. 

 Hal. Port Denison. 



54. Conescharellina conica, 5j;. nov., Plate III., figs. 7 and 8. 



Zoarium conical, much elevated. Cell-apertures and avicularia 

 in alternate, radiating rows ; cell-apertures circular or oval, with 

 a projecting lip on either side. Avicularia raised, triangular; 

 upper (movable) mandible with the apex usually more or less 

 produced. 



55. Selenaria maculata. Bush. 



56. Selenaria fenestrata, s/;. nov. 



Differs from the preceding in the presence of two small f enestrse 

 on the wall of each cell. 



57. Sphaeropora fossa, gen. et sp. nov., Plate III., figs. 5 and 6. 



Zoarium sub-spherical, slightly depressed, with a circular pit 

 at the upper pole ; whole surface occupied by cells. Cells and 

 vibracular pits very irregularly arranged ; cells ventricose, 

 granular ; mouth semicircular ; a secondary aperture, larger than 

 the mouth and of similar form, occupied b}^ membrane. 



The most remarkable point about this curious species is the pit 

 at its upper pole. This is alwaj's present and in +he same position ; 

 it is large enough to admit the point of an ordinary stout sewing 

 needle, (being about '75 mm. in diameter at the mouth), and 



