Zoology.} NATURAL HISTORY OF VICTORIA. [Poli/zoa. 



with a serrated beak ; older zocecia, especially the fertile, with the peristome of the 

 lower lip produced forwards and frequently with a short columnar process, sur- 

 mounted by an oval avicularium. Ooecia g-lobular, reclinate, with a semi-circular 

 area in front, bounded by a narrow raised line, along- the margin of which is a series 

 of short, concentric, triangular marks. Scattered vicarious avicularia with spatulate 

 mandibles. 



Port Phillip Heads, a single specimen, Mr. J. Bracebridge 

 Wilson. 



The aviculiferous process iu the young marginal zooBcia has 

 considerable resemblance to the semi-spiral tube in Lagenipora 

 nitens, which possibly ought to be referred to this genus. 



Explanation of Fiqdres. 



Plate 165. — Fig. 2, specimen, natural size. Fig. 2a, young zooecia. Fig. 2b, older zooecia 

 and ooecia. Fig. 2c, ooecium and vicarious avicularium. 



Plate 165, Fig. 3. 

 CELLEPORA SPICATA (McG.). 



Description. — Zoarium forming bilaminate folds. Zocecia at the growing 

 margin nearly horizontal, oval or bariel-shaped, smooth or very minutely and 

 sparsely granular; mouth semi-circular, nearly straight below j a long, sharply 

 conical rostrum projecting from one side of the lower lip, with a small avicularium 

 overhanging a notch at the base. In older parts the zooecia nearly vertical, very 

 much confused; a short pre-oral rostrum with basal avicularium; sometimes a long, 

 trumpet-shaped rostrum, surmounted by an avicularium, from the side of the mouth ; 

 occasionally more than one rostrum and sometimes the mouth unarmed, semicircular 

 or oval, and with the part below the lower lip thin and projecting. Ooecia cucullate, 

 sub-immersed, smooth, a conical rostrum rising from a thickened base on the anterior 

 surface over the middle of the marginal lip, with a small avicularium (frequently 

 absent) at the base. 



Port Phillip Heads. 



Explanation or Fiodrbs. 



pLATK 165. — Fig. .3, zooecia from growing edge. Figs. 3a and 5b, zooecia and ooecia from 

 the central parts. Fig. 3c, vicarious avicularium. 



Plate 168. — Fig. 8, opercula. 



C 242 ] 



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