132 Australian Polyzoa. 



31. falcata. 



Cells obscurely hexagonal, separated by raised beaded 

 margins ; front in great part filled in by a tubercular calcareous 

 plate. Avicularia scattered irregularly, replacing a cell, 

 mandible large, falciform. Ovicell small, round, granular. 



Snapper Point, on a mussel shell. 



M. ciliata. 



Cells broadly ovate, separated by narrow raised margins ; 

 front of cell almost entirely occupied by a calcareous, gran- 

 ular, membrane ; a series of (4-7) long, hollow spines 

 articulated round the upper end of the cell. 



On Algae, frequent. 



This very peculiar species occurs in small patches on algae. 



The cells are irregularly arranged, separated by narrow 

 raised margins ; the greater part of the front is occupied by 

 a calcareous tubercular plate, the upper margin of which 

 has a thickened rim ; the aperture left is small, and from 

 the size and shape and the arrangement of the spines, might 

 readily be mistaken for a mouth with a straight thick lower 

 lip. Round the margin of the cell opposite the aperture, 

 there is a series of long, thick, articulated, hollow spines. 

 These are so long as, in many specimens, greatly to obscure 

 the cells underneath. In some specimens, on narrow algae, 

 the front of the cell is much thinner and quite smooth. 



Genus LEPRALIA, Johnston. 

 L. vittata. 



Cells ovate, separated by irregularly reticulated spaces ; 

 front of cell with a broad vitta commencing below the 

 mouth and extending to near the base of the cell, and a row 

 of small perforations on each side close to the margin; 

 mouth arched above, nearly straight below. A roundish or 

 pyriform avicularium above each cell. 



On oyster-shell from Western Port. 



A beautiful species, at once distinguished from all others 

 by the peculiar anterior vitta. 



L. ferox. 



Cells confused, coalescent ; front pierced with several 

 large apertures ; mouth large, with 1-3 small denticles on 

 one side ; lower lip occupied by an enormous avicularium. 



On Sargassum, Williamstown ; on algae Queenscliff. 



This species forms small thick layers encrusting algae. 



