Australian Polyzoa. 129 



Family BICELLARIIDjE. 



Genus BICELLAMA, Blainville. 



B. tuvbiiyida. 



Cells elongated, much contracted below ; opening circular 

 or nearly so, directed obliquely upwards and forwards ; 

 usually four long, submarginal spines. 



QueensclifF, a single specimen. 



The general appearance of this species is very much that 

 of B. grandis, Busk, from which, however, and B. Tuba it 

 is readily distinguished. It differs from the former in the shape 

 of the cell and direction of its opening, which is nearly round, 

 and looks upwards and forwards, and from the latter in the 

 absence of the peculiar spine-bearing process from the outer 

 margin. In the more perfect cells, there are generally four, 

 long, hollow, articulated, submarginal processes, of which two 

 arise almost together from the outer part, one from the upper 

 edge, and the fourth, longer and directed more vertically, 

 from the anterior edge. The aperture is usually occupied by 

 a thin membrane, in the outer half of which is the semi- 

 circular mouth. 



Genus BUGULA, Ohm. 

 B. robusta. 



Cells biserial, contracted below, upper and outer angle 

 produced into a short, hollow conical process ; aperture 

 oval, not extending to the base. A large avicularium on 

 the lower part of the cell, below and to the outside of the 

 aperture. 



Western Port. 



Of this species I have a tuft nearly two inches high. It 

 is of a greyish-brown colour. It is readily distinguished 

 from the other described species. The cells are large, the 

 whole outer angle produced into a stout, conical process ; 

 the inner angle is rounded,, and has no spine or prolongation. 

 The aperture does not extend to the base ; and on the entire 

 part of the cell, to the outside and below the level of the 

 aperture, is a large pedunculate, avicularium. I have not 

 seen ovicells. 



