Zoology.-] NATURAL HISTORY OF VICTORIA. \JPolyzoa. 



Forms very small brownish-white tufts about half an inch high. 

 Queenscliff, and probably in other localities. 



This very curious species is readily distinguished from 0. aurita, 

 the only form to which it has any resemblance. All the axial cells 

 in a branch are geminate. The bifurcations are numerous, at every 

 third or fourth cell. From the secondary cell of each geminate 

 pair, except those of bifurcation, springs a small wedge-shaped cell. 



The mouths of the ordinary geminate cells are surrounded above 

 by a series of 4 or 5 hollow blunt processes ; the wedge-shaped 

 peripheral cells are always surmounted by a pair of long, slightly 

 diverging processes directed upwards. 



Explanation of Figures. 



Plate 24. — Fig. 17, natural size. Fig. 17a, front view of a small branchlet, showing the 

 axial double cells and the small lateral cells, magnified. Fig. 176, back view of cells, magnified. 



CATENICELLA CORNUTA (Busk). 



Description. — Cells elongated, papillose in front. Vittse lateral, extending* the 

 whole length of the cell. One or both lateral processes long, pointed, and recurved, 

 with a small aperture at the base. Ovicell galeate, sessile on one of the cells of a 

 geminate pair, terminal, surmounted by a sharp spine. 



Reference.— Busk, Voy. Ratt., i., 361 ; Cat. Mar. Pol. Brit. Mus., 1. 10, f. 

 I, 2, 3. 



Forms small greyish tufts, 1 to 2 inches high. Queenscliff. 



The only species with which this is likely to be confounded is 

 C. perforata, from which it may be distinguished by the retrocedent 

 spinous lateral processes, and by the spine on the summit of the 

 ovicell. 



CATENICELLA INTERMEDIA (P. MacGil.). 



Description. — Cells large, wide. Mouth vertical or nearly so. Front of 

 cell with five large fenestra. Lateral processes very wide, usually abortive on one 

 side. Back of cell smooth. 



Reference.— P. H. MacGillivray, Trans. Royal Soc. Vict., 1868. 



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