Zoohyy.] NATURAL HISTORY OF VICTORIA. [Polyzoa. 



I had previously (Trans. Roy. Soc. Vict. 1868) described this 

 as M. falcata, but as my description was taken from a single 

 imperfect specimen, it was scarcely exact enough. I have there- 

 fore adopted the name subsequently given to it by Mr. Ilincks, 

 who described it from better specimens. The whole zoarium is 

 very calcareous, the calcareous lamina of the membranous aperture 

 being thick and granular. The avicularia are very peculiar. 

 They are situated on special tracts at the base of small, imperfectly 

 developed zocecia intercalated among the others. The inaudible is 

 falciform, the concave edge thick, the other formed by a thin 

 membrane ; it expands at each side at the base, like the cross-piece 

 of the handle of a sword. The ocecia are prominent, globose, and 

 divided by a concentric smooth band, the part below which is 

 finely granular, the part above being smooth, or with coarser 

 granulations. 



Explanation of Figure. 

 Plate 106. — Fig. 3, small portion of a. specimen, magnified, .showing an avicularium and 

 two occeia. 



Plate 106, Fig. 4. 



PYRIPOEA CRASSA (McG.). 



[Genus PYRIPORA (D'Orbigny). (Sub-kingd. Mollusca. Class Polyzoa. Order 

 Infundibulata. Sub-order Cheilostomata. Fam. Membraniporidaj.) 



Gen. Char. — Zoarium adherent. Zooeeia distinct, thick, calcareous, convex, not separated 

 by raised lines, narrowed below, in branched single series or forming continuous expansions ; a 

 large oblique aperture in front, filled by a thin membrane.] 



Description. — Zooeeia. large, much attenuated downwards, surface not anuu- 

 lated ; aperture large, its margin thickened, with a thick, lip-like projection from 

 the lower border. 



Reference. — Hippolhoa crassa, P. II. MacGillivray, Trans. Hoy. Soc. Vict. 

 1808. 



Queenscliff. 



Differs from P. catenularia in the thick projection from the 

 lower margin of the aperture, and from P. polita in the absence of 

 the thick lateral masses. 



Explanation of Figure. 

 Plate 106. — Fig. 4, portion of a specimen, magnified. 



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