Zoology.-] NATURAL HISTORY OF VICTORLA.. \_Polyzoa. 



Description. — Zoarium dichotomously branched, the internodes short and 

 connected by double tubes. Zocecia arranged round the axis in four series, three or 

 four in each series, alternate, elliptical or ovate, with the sides raised into a thin 

 margin ; aperture occupied by a thin membrane which is thickened for a small space 

 inferiorly. A subimmersed avicularium on either side of the zocecia, those of the 

 adjacent series occupying- a separate tract; the anterior surface bounded by a 

 thickened margin, the intermediate part being occupied by a membrane ; at the 

 summit a small beak, with sharp, curved point, the mandible pointing outwards. 



Reference. — Hincks, Ann. and Mag. Nat. Hist., March 1883. 



Port Phillip Heads, Mr. J. Bracebridge Wilson. 



The structure of the zooecia of Farcimia undoubtedly places 

 it among the Cellulariidce. The avicularia are comparable, as 

 pointed out by Mr. Hincks, to those of Scrupoc€lla7'ia, from which 

 they differ in having the free side occupied by a membrane and 

 bounded by a thickened band ; the beak and mandible are very 

 small. Frequently a peculiar narrow, membranous appendage, 

 terminating in a hard, sharp point, springs from the side of the 

 avicularium. 



Explanation op Figures. 



Plate 178. — Fig. 6, portion of specimen, natural size. Fig. 6a, internode, magnified. 

 Fig. 66, appendage of avicularium. 



Plate 178, Fig. 7. 

 CATENICELLA RINGENS (Busk). 



[Genus CATENICELLA (Blainville). (Sub-kingdom MoUusca. Class Polyzoa. Order 

 Infuudibulata. Sub-order Chellostomata. Family CateuicelUdEe.) 



Gen. C/iar.— -Branches originating from the summits of eacli of a geminate pair, or rarely 

 from the sides of ordinary zooecia. Zooecia in single series, but at a bifurcation geminate, or 

 each internode consisting of a geminate pair ; mouth with simple margins, straight or hollowed 

 and entire below, or with a small rounded notch.] 



Description. — Zoarium dichotomously branched. Zooecia broadly ovate, 

 smooth and shining; a broad anterior vitta on each side extending from the base to 

 near the level of the mouth ; a large, lateral process, slightly turned forwards, on 

 each side, with a widely gaping avicularium and a round mark at the base; mouth 

 lofty, slightly hollowed below. Posterior surface smooth. 



Reference. — Busk, Brit. Mus. Cat., Mar. Pol., pt. i., p. 10, pi. viii., figs. 3 

 and 4. 



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