BY WILLIAM A. IIASWELL, M.A., B.SC. 353 



6. Pustulopora parasitica, Busk. 



Pustulopora parasitica, Bush. I. c, p. 21, pi. xvii., figs. 1 — 2. 



" Zoarium about a quarter inch high, usually formed of 1 — 3 

 branches, short and truncate ; cells usually deeply immersed and 

 very slightly prominent, except in very young specimens. Colour 

 brown with white spots." 



Port Jackson, parasitic on Catenicella ventricosa. 



Genus Tubulipora, Lamarck. 



7. Tubulipora flabellaris, Johnston. 



Tubulipora flabellaris, Johnston, Brit. Zooph., p. 274, pi. 46, 

 figs. 5, 6 ; Busk, I. c, p. 26, pi. xxiv., xxv. 



" Zoarium adnate, fan-shaped, often recurved on the sides; 

 cells decumbent, cells irregularly disposed, or obscurely serial." 



Common on Laminaria in Port Jackson ; semingly identical 

 with the British and Scandinavian species above named. 



Genus Discoporella, Gray. 



Discoporella are very numerous in Port Jackson; a small- 

 leaved species of fucus growing on Clark Island and in other 

 situations is generally so closely covered with these polyzoa, 

 together with a species of Lepralia, that the stem is entirely 

 concealed. After a comparison of a considerable number of 

 specimens found on this fucus and in other situations, I am 

 inclined to regard them as consisting of at least five species which 

 I have determined as follows : — 



8. Discoporella novre-zelandiae, Busk. 



Discoporella novae-zelandia?, Bush, I. c, p. 32, pi. 30, fig. 2. 



" Discoid, cupped ; cells tubular, projecting, connate in 

 uniserial radii ; peristome bifid ; central area (unoccupied by cells) 



