Zoology.-] NATUKAL HISTORY OF VICTORIA. \Tolyzoa. 



very wide and covered by a thin membrane, is another similar 

 closed compartment extending almost to the base of the cell. This 

 gives to the cell a peculiar hexagonal or rhomboidal figure, which, 

 with the constant three foramina, at once distinguishes this from 

 the other species. The ovicell is of large size, surmounted by a 

 single avicularium. 



Explanation of Figures. 



Plate 24.— Fig. 8, natural size. Fig. 8a, front view of cells, with ovicell, magnified. 

 Fig. 86, back of cells, magnified. 



Plate 24, Fig. 9. 



CATENICELLA FORMOSA (Busk). 



Description. — Cells pyriform or subglobular; in front covered with numerous 

 papillae; a broadly linear or elliptical vitta extends up each side. Lateral processes 

 large, straight or nearly so above, produced downwards as a narrow fringe, a round 

 perforation at the base of each. Avicularia small, lodged in shallow excavations. 

 Back of cell smooth. 



Reference.— Busk, Voy. Ratt., i., 360 ; Cat. Mar. Pol. Brit. Mus., t. 7, f. 1, 2. 



Queenscliff, Cape Schanck, Rivoli Bay, and other places. 



This, the largest as yet known of the vittate division, forms 

 handsome dusky -brown tufts. The cells are broadly pyriform or 

 subglobose. The front is covered with minute, pointed, papillae, 

 and has, on either side, a broad vitta, extending from the base to 

 nearly the level of the lower lip. The lateral processes are large, 

 straight above, generally projecting a little upwards, and produced 

 inferiorly into a narrow fringe usually running to the base of the 

 cells ; on each process there is at the base nearly opposite the 

 lower lip a constant round opening ; the avicularium is of small 

 size, and lodged in a shallow excavation in the edge of the lateral 

 process. 



Explanation of Figubes. 



Plate 24.— Fig. 9, natural size. Fig. 9a, front view of cells, magnified. Fig. 9b, back 

 view of cells, magnified. 



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