Zoology. - ] NATURAL HISTORY OF VICTORIA. {Polyzoa. 



arranged round the axis. The aperture occupies about two-thirds 

 of the front, and the edge is prolonged into two short spines, the 

 upper one at the extreme angle being the larger ; the inner angle 

 is nearly square or produced into a slight spine. The ovicells are 

 large, in dry specimens cucullate or saucer-shaped, but said by 

 Mr. Maplestone to be globular when alive. 



Explanation op Figures. 



Fig. 2, specimen, natural size. Fig. 2a, front view of portion, magnified. Fig. 26, single 

 cell, more highly magnified, showing ovicells and avicularium. Fig. 2c, back view of fragment, 

 magnified. 



Plate 78, Fig. 3. 



BUGULA DENTATA (Lamx.). 



Description. — Cells biserial, elongated; three long, hollow spines at the 

 upper and outer part of the aperture, and a single similar one at the inner angle ; 

 aperture occupying- rather more than half of the front of the cell ; avicularia large, 

 articulated below and to the outside of the lower corner of the aperture. 



Reference. — Busk, Brit. Mus. Cat, Mar. Polyzoa, p. 46, pi. xxxv. 



Queenscliff ; Hobson's Bay. 



This species occurs in small tufts, of a dull-greenish or leaden 

 colour, on piles, hulks, &c. It is at once recognised by the three 

 long spines at and below the upper and outer angle of the 

 aperture ; of these the lower is turned inwards, while the upper 

 two project forwards or outwards. There is also a similar but 

 smaller spine at the upper and inner angle. I have not seen the 

 ovicells ; they are said to be blue. 



Lamouroux describes his B. dentata as having only two spines, 

 but I think there can be no doubt it is the species here described. 



Explanation of Figures, 



Fig. 3, fragment, natural size. Fig. 3a, front view, magnified. Fig. 36, side of cell, 

 showing an avicularium. Fig. 3c, back view, magnified. 



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