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



Plate 137, Figs. 1 and 5. A 



CABEREA DARWINII (Busk). 



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

 ulata. Sub-order Cheilostomata. Family Cellulariida;.) 



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

 bi-multiserial, quadrate. An aviculariam on tbe 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 flabelliform. Zooecia biserial, elongated, narrowed 

 downwards; area large, filled in by a granulated expansion with a thickened crenu- 

 lated margin; aperture elliptical, almost entirely (except the part occupied by tbe 

 mouth) covered by tbe scutum, which has a peculiar helicine mark ; two articulated 

 spines at tbe upper and outer angle, and usually one, as well as a peduncular one, 

 from the inner ano-le. A small avicularium on the outside of each lateral zocecium 

 on a narrow prominence; a sessile avicularium at the base of each peduncular spine, 

 with the bluntly triangular mandible pointed downwards; occasionally a small 

 avicularium, with triangular mandible directed upwards, situated between two zoopcia. 

 Ooecia smooth in young specimens, with a marginal rim in older. Posteriorly the 

 vibracula are much elongated, spindle-shaped, with long serrated setse. Radical 

 tubes numerous, springing from the lower part of the zooecia, and converging to form 

 a ridge down the back of the branches. 



Reference. — Busk, Challenger Polyzoa, p. 29. 



Port Phillip Heads ; Portland, Mr. Maplestone. 



In the Challenger Polyzoa, Mr. Busk describes and figures a 

 form from New Zealand under the name of C. Darwinii, which 

 he says: is identical with that described in the British Museum 

 Catalogue as C. Boryi and figured as C. Patagonica. It is not 

 uncommon here, and I quite agree with Busk in considering it as 

 distinct from the European species, with which it and the next have 

 been generally confounded. It is characterised by the zooecia 

 being narrowed downwards, the lower part and sides of the area 

 filled in by a granular layer, with the margin of the aperture finely 

 crenulate. In perfect specimens, the scutum is of large size, nearly 

 filling all the aperture, except that part corresponding to the 

 mouth. It is nearly straight above, with frequently a small 

 process or spur projecting upwards, and the large downwardly 

 expanded lamina has a peculiar helicine mark. Busk describes 

 and figures the scutum as plain ; but there can be no doubt of the 



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