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



Plate 186, Fig. 1. 

 CABEREA RUDIS (Busk). 



[Genus CABEREA (Lasix). (Sub-kingdom Mollusca. Class Polyzoa. Order Infundib- 

 ulata. Sub-order Cheilostomata. Family Cellulariidae.) 



Gen. Char. — Zoarium continuous, or imperfectly jointed, dichotomously branched. Zooecia 

 bi-multiserial, quadrate ; an avicularium on the outer side of the lateral, and one or two at the 

 base of the internal zooecia. Vibracula large, situated at the back of the branches, biserial, 

 each common to several zooecia.] 



Description. — Zoarium with the branches broad, about one-eighth of an inch, 

 strap-shaped. Zooecia multiserial ; membranous aperture large, elliptical ; three 

 large spines articulated at the upper and outer and one at the inner angle of the 

 lateral zooecia ; one or two on each angle of the inner zooecia; a stout anvil-shaped 

 scutum with a thick peduncle overarching the aperture. Ooecia flat, mitriform, with 

 a thickened margin. In the central zocecia two slightly raised avicularia, with 

 triangular mandibles pointing upwards, on the lamina below the aperture; on the 

 lateral zocecia a single large avicularium, narrowed below and expanded above, with 

 a thickened margin and stout beak to the rostrum, and a long, triangular, pointed 

 mandible directed horizontally outwards. Posterior surface flat, outline of zocecia 

 diamond-shaped, longitudinally sulcate. Vibracular setae short, slender, slightly 

 serrated, the vibracular cells narrow, and not obscuring the posterior outlines of the 

 zocecia. Radical fibres springing from the bases of the zocecia, uniting to form a 

 lateral bundle. 



Reference. — Busk, Brit. Mus. Cat. Mar. Pol., pt. i., p. 37, pi. xlvi. 



Port Phillip Heads ; Portland, Mr. Maplestone. 



Forms tufts, of a dirty white color, attaining a height of two 

 inches or more. It is readily distinguished by the large lateral 

 avicularia, which are frequently of enormous size, and by the 

 small size of the vibracular cells, not obscuring the posterior 

 outlines of the zocecia, with the short slender setae. 



Explanation of Figures. 

 Plate 136. — Fig. 1, specimen, natural size. Fig. la, portion of anterior surface, magnified 

 showing, on one side, the lateral avicularia of enormous size. Fig. lb, posterior view of same, 

 showing the outlines of zooecia, vibracular cells, and radical fibres. 



Plate 136, Fig. 2. 



CABEREA GRANDIS (Hlncks). 



Description. — Zoarium with the branches rather broad, strap-shaped. Zooecia 

 multiserial ; membranous aperture large, elliptical or oblong ; two spines on the 

 outer and one on the inner angle of the marginal zooecia, and one on each angle of the 



[ 13?] 



