Zoology.-] NATURAL HISTORY OF VICTORIA. [Polyzoa. 



This species forms small glassy tufts. The internodes are 

 narrow, and consist of a few series of cells. The cells are usually 

 nearly hexagonal and pointed above and below ; the separating 

 margins are much raised, generally smooth ; the surface also is 

 smooth or very obscurely granular. The mouth is situated rather 

 above the middle ; the upper lip is lofty and arched ; the lower lip 

 is also arched upwards, and frequently has a small denticle at either 

 end. In some specimens the cells are much wider and rounded 

 above. These are more frequently found in the expanded portions 

 where the deeply immersed ovicells are situated. The ovarian 

 pores are small, and situated at the upper part of a cell. The 

 avicularia take the place of cells in a series ; the mandible is very 

 long and narrow. 



Explanation of Figures. 



Plate 49. — Fig. 3, specimen, natural size. Fig. 3a, an internode, magnified. Fig. 36, small 

 portion, more highly magnified, showing 2 avicularia. Fig. 3c, small portion of the form with 

 the wider cells rounded above, and showing the ovarian pores. 



Plate 49, Fig. 4. 

 CELLARIA GRACILIS (Busk). 



Description. — Polyzoary small ; cells in a series distant, elongated, hexagonal, 

 usually pointed above and below ; surface minutely granular ; mouth at or above 

 the middle, arched above, lower lip also slightly arched upwards. Avicularium 

 replacing a cell, mandible very large and semicircular. 



Reference. — Salicornaria id,, Busk, Cat. Mar. Pol. Brit. Mus., p. 17, pi. lxiii., 

 fig. 3 ; pi. lxv. (bis), fig. 2. 



Queenscliff ; Sealer's Cove, Baron von Mueller. 



In this and the preceding species, the size and habit of growth, 

 and the size and appearance of the cells, are very similar, and in 

 the absence of the avicularia it would be impossible to distinguish 

 them with certainty. These organs, however, are very characte- 

 ristic. In both they take the place of cells in a series. In C. tenui- 

 rostris the mandible is long, narrow, and pointed upwards, while in 



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