Zoology.-] NATURAL HISTORY OF VICTORIA. [Pc&yzoa. 



central ; a spatulate or clavate scutum with thick peduncle, usually of small size. 

 Ocecia flat, mitriform, with a thickened rim. One or two avicularia at the base of each 

 central zooecium, with the mandible usually directed upwards ; on the lateral zooecia 

 a very small avicularium, with the mandible placed transversely, on a long, narrow 

 process united throughout to the cell; on various parts of the zoarium occasionally 

 intercalated avicularia of enormous size, Posterior surface of the zocecia entirely 

 obscured by the vibracular cells, which are distinct, almond-shaped, those of oppo- 

 site sides meeting in a groove in the centre of the branch ; setse long and serrated. 

 No radical tubes. 



Eeference. — Hincks, Ann. and Mag. Nat. Hist., July 1881. 



Port Phillip Heads. 



This species, which attains a height of an inch or more, is 

 readily distinguished from the other multiserial species by the 

 small lateral avicularia, the projection of the vibracular cells 

 beyond the margins of the branches, so as to be visible from the 

 front, and their completely obscuring the posterior surface of the 

 zooecia. The size and disposition of the vibracular cells, with the 

 long serrated setse, and the deep groove between the rows, make a 

 striking resemblance to a miniature head of barley. The large 

 avicularia are not frequent, being absent in many sj)ecimens. The 

 oral spines, also, are by no means constantly seen, either from being- 

 absent or worn off. 



Explanation of Pigures. 

 Plate 136. — Fig. 2, specimen, natural size. Pig. 2a, anterior surface of portion of same, 

 magnified ; two large avicularia are shown, one of great size. Pig. lb, posterior view of the 

 same. 



Plate 136, Fig. 3. 

 CANDA ARACHNOIDES (Lamx.). 



[Genus CANDA (Lamx.). (Sub-kingdom Mollusca. Class Polyzoa. Order Infundibulata. 

 Sub-order Cheilostomata. Family Cellulariida?.) 



Gen. Char. — Zoarium dichotomously branched, branches biserial, connected by transverse 

 chitinous tubes attached at either end to a vibraculum. Avicularia large, situated on a special 

 tract on the front of the branches between the rows of zooecia. Each zoceciuni with a vibracu- 

 lum posteriorly.] 



Description. — Branches rather broad; zocecia quadrate, a spine at each upper 

 angle, of which that on the outer is the larger; margin thickened, crenulated; 

 aperture elliptical, the lamina smooth or finely granular. Avicularia with the 

 mandibles broadly triangular. Posteriorly the zooecia elongated, wider in upper 

 half, separated by thick, raised lines. The vibracular groove not extending beyond 

 the median line ; setse short, smooth. Connecting tubes stout. 



Reference. — Busk, Brit. Mus. Cat. Mar. Polyzoa, p't. i., p. 26, pi. xxxiii.; 

 Busk, Challenger Polyzoa,, p. 25. 



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