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



The beautiful vase-like shape of the cells aud avicularian pro- 

 cesses, with the anterior vertical slit and regular pyriform feiiestrse, 

 are sufficiently characteristic of this sj^ecies. 



Explanation of Figures. 



Plate 89. — Fig. 2, portion, natural size. Fig. 2a, front view of cells, magnified. Fig. 2b, 

 back of cells, magnified. 



Plate 89, Fig. 3. 



CATENICELLA WILSONI (P. McG.)- 



Description. — Cells large, squared at both ends. Mouth deeply arched above, 

 the lower lip straight and entire. A s))ace down the centre of the cell, of the same 

 width as the mouth, occupied by a double row of (usually) 7 large, closely set, 

 shallow fenestrne. The sides slope backwards from the margin of the fenestrate 

 area, forming on each side a smooth, slightly hollowed space, nearly as wide as the 

 central division, with an avicularian chamber at the upper angle. Back of cell 

 with a prominent central band, extending the whole length, and, at about a third of 

 the distance from the top, giving ofi' a similar transverse band on each side. Ovicell 

 large, rounded, terminal. 



Reference. — P. H. MacGillivray, Ti-ans. Roy. Soc. Vict. 1880. 



Port Phillip Heads, Mr. J. B. Wilson. 



This handsome species cannot he confounded with any other. 

 It is distinguished hy the size of the cells and the regular space 

 down the front occupied by the close-set double row of foramina. 

 This is in reality the true front of the cell, the sloping spaces at 

 the sides corresponding to the lateral processes of other species. 

 At the upper angle there is a minute avicularian chamber. The 

 ovicell is of great size, terminal, thickly covered with large, 

 rounded fenestra?. The cell which it surmounts springs from one 

 of a geminate pair ; it differs ft'om the others in being short, wide, 

 without lateral extensions, and, instead of the regular fenestrate 

 area, having a variable number of 3-5 large fenestra? ; there is also 

 usually a l)u]ging on each side of the lower lip, seemingly support- 

 ing a horizontal avicularium. 



Explanation of Figures. 



Plate 89. — Fig. 3, branch, natural size. Fig. Sr/, portion, showing front of cells and ovi- 

 cell, magnified. Fig. 36, back of cells, magnified. 



[30] 



