Zoology,-] NATURAL HISTORY OF VICTORIA. \_Polyzoa. 



Queenscliff ; Portland, Mr. Maplestone ; frequent. 



Forms tufts 1 to 2 inches high. The cylinders frequently 

 present, towards the superior extremity, swollen portions corre- 

 sponding to the situation of the immersed ovicells. The form of 

 the cell varies, being hexagonal, rhomboidal, with the upper and 

 lower edges straight, or the upper arched or pointed ; frequently 

 the upper end is arched, and the lower part much contracted. 

 The forms of the cells are very similar to those described in the 

 last species. At the base of each cell there is generally a long, 

 hollow, corneous process ; in some specimens each cell has 2 ; 

 and occasionally they are wanting, but never from all the cells of a 

 polyzoary ; they are distinct from the radical tubes, which may be 

 occasionally seen arising from the same cells at the base of an 

 internode. The ovicell is totally immersed ; the ovarian pore is 

 widely lunate, at the summit of an ordinary cell. The avicularium 

 is of great size. It takes the place of a cell in a series ; it is larger 

 than the adjacent cells and of a similar form ; the mandible is very 

 large, semicircular, and occupies about a third of the cell. 



Explanation of Figures. 



Plate 49. — Fig. 2, specimen, natural size. Fig. 2a, portion of internode, magnified. Fig. 

 26, small portion of a series, more highly magnified, showing above an avicularium, and in the 

 lower cell an ovarian pore. 



Plate 49, Fig. 3. 

 CELLAEIA TENUIROSTRIS (Busk). 



Description. — Polyzoary small, formed of long narrow cylinders ; cells in a 

 series distant, elongated, usually hexagonal and pointed above and below, sometimes 

 wide and arched above ; mouth arched above, lower lip arched forwards, and some- 

 times with a minute denticle at either side. Ovicell deeply immersed, opening by a 

 round pore at the upper part of a cell. Avicularium replacing a cell, mandible very 

 long, narrow, and pointed upwards. 



Reference. — Salicornaria id., Busk, Cat. Mar. Pol. Brit. Mus., p. 17, pi. lxiii., 

 fig. 4. 



Queenscliff ; Sealer's Cove and Cape Le Febre, Baron von 

 Mueller. 



Dec. v. [ 49 ] q 



