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Art. X. — On some new Australian Polyzoa. By P. H. 

 MacGillivray, Esq., A.M.., M.R.C.S. 



[Read before the Institute 3rd August, 1859.] 

 (With a Plate.) 



Sub-order Polyzoa Cheilostomata. 



Fam. Flustradce. 



Flustra denticulata, Busk. (Fig. 1). Of this species I have 

 received specimens of a well-marked variety from Queens- 

 cliff, King's Island, and Port Curtis. It agrees with the 

 normal form in the series of minute marginal denticles* but 

 is peculiar in the constant presence of two stout, blunt spines 

 on either side of the cell mouth. For this variety I would 

 propose the name quadricornis. 



Carbasea cyathiformis (Fig. 2). Polyzoary erect, cup- 

 shaped; cells oblong, slightly arching above, aperture entirely 

 filled in; mouth lunate; back of cells thickly beset with small, 

 rounded eminences. Avicularia O. 



Queenscliff, parasitic on Bicellaria and Catenicella — Mrs. 

 Dr. Robertson. 



The peculiar form of this elegant species sufficiently dis- 

 tinguishes it from all its congeners. Its nearest affinity is 

 with the New Zealand C. indivisa (Busk.). 



Fam. Membraniporadce. 



Membranipora perforata, new species (Fig. 5). Cells very 

 irregular in shape, generally obscurely hexagonal ; margins 

 raised, faintly grooved longitudinally ; mouth narrow, with 

 slightly thickened lips, and a stout spine at either side supe- 

 riorly ; surface of cell minutely cribriform, with a large round 

 opening on either side, close to the margin ; ovicells large, 

 galeate, widely open beneath, granular; avicularia large, 

 situated at the base of the cells. 



Queenscliff, on seaweed. 



The irregular form of the cells, and the lateral foramina, 

 as well as the large size of the ovicells, and the peculiar 

 position of the avicularia, sufficiently distinguish this from 

 all previously described species. 



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