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



Plate 36, Fig. 3. 



(This represents a specimen of Membranipora perforata in which 

 the cell-walls were very much thickened. ) 



Plate 36, Fig. 4. 

 LEPRALIA ELEGANS (P. McG.). 



Description. — Cells diamond-shaped, irregularly oval or hexagonal, separated 

 by a thick raised margin ; mouth nearly round, with a slightly thickened lip ; front 

 areolated, the areolse frequently radiating from an elevated portion below the mouth. 



Reference. — P. H. MacGillivray, Trans. Phil. Instit. Vict, 1859. 



On shells and stones, Williamstown and Queenscliff. 



Explanation op Figures. 

 Plate 36.— Fig. 4, natural size. Fig. 4a, magnified. 



Plate 36, Figs. 5 and 6. 



LEPRALIA PERTUSA (Esper. sp.). 



Description. — Polyzoary large, adherent, occasionally sub-erect ; cells large, 

 elongated, separated bj' raised margins ; surface deeply areolated or pierced with 

 numerous large openings ; mouth arched above, straight or hollowed below. 



Reference. — Busk, Brit. Mus. Cat., p. 80, t. Ixxviii. ; Ixxix., 1, 2. 



A common and very variable species. The cells are very large, 

 separated by narrow, raised lines, and with large perforations, the 

 perforations or areola? being sometimes more regular and larger 

 along the margins, as in Fig. 6a. The mouth varies in shape, being 

 usually nearly round, with the smooth lower lip entire, prominent 

 or with a slight sinus. In some specimens the mouth is deep, 



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