126 Australian Polyzoa. 



Art. XXI. — Descriptions of some new Genera and Species 

 of Australian Polyzoa ; to which is added a List of 

 Species found in Victoria. By P. H. MacGillivray, 

 A.M, M.R.C.S. 



[Read 26th November, 1868.] 



In the present paper are given descriptions of forty-eight 

 Species, including two Genera, of Australian Polyzoa, which 

 cannot be satisfactorily referred to any of those hitherto 

 described. The identification of Polyzoa by the aid of 

 descriptions alone, however accurate these may be, is often 

 extremely difficult. The species here described, as well as 

 the others existing in Victoria, will be figured in Professor 

 M'Coy's " Memoirs of the Museum," where I ho^e to be able 

 to give descriptions of all those with which I am acquainted. 

 Specimens will also be deposited in the National Museum. 

 I have added a list which contains all the Victorian species 

 I have in my collection, with the exception of a few not yet 

 determined. 



Family CATENICELLIDJE. 

 Genus CATENICELLA, Blainville. 



G. rufa. 



Cells vase-formed ; lateral processes small, pointed. Front 

 of cell pierced by numerous round fenestrse, the circumfer- 

 ential being the largest ; mouth with a notch in the lower 

 lip. On the back of the cell an elevated band runs up the 

 middle, sending a narrow branch horizontally to each lateral 

 process, and a small band extends up each side. Ovicells 

 large, cribriform, surmounted by two avicularia. 



Common, forming handsome reddish-brown tufts, four or 

 five inches high. 



The only species with which this can be confounded 

 is G. cribraria, Busk, from which, however, it is easily 

 distinguished. In G. cribraria, the lower lip is entire, 

 and there is a crescentic pore a short distance beneath it ; 

 and the back is smooth and destitute of any special 

 marks. In G. rufa, instead of the suboral pore, the 

 centre of the lower lip presents a constant notch ; the 

 avicularian processes are small and pointed, and the 

 back of the cell is occupied by a broad mesial band, 



