Zoology.] NATURAL HISTORY OF VICTORIA. [Pofyzoa. 



The present species, Membranipora pilosa and E. verticillata, 

 constitute a well-marked generic group. In all three the zocecium 

 is of the same structure, the lower part, separated from its 

 neighbours by a groove, is convex, covered with oval puncta or 

 depressions. The aperture occupies the whole width of the upper 

 part of the zocecium, its margins thickened and those of contiguous 

 zocecia closely united. One large spine seems to be nearly 

 constant (sometimes replaced by an avicularium) below the 

 aperture, and there are other smaller spines on different parts of 

 the margin. In E. verticillata the cells are trumpet-shaped, and 

 the aperture consequently very oblique. 



Explanation of Figures. 

 Plate 106. — Figs. 7, 7a, portion magnified, the lower half the amplification of the upper. 



Plate 106, Fig. 8. 



BATHYPORA PORCELLANA (McG.). 



[Genus BATHYPORA (McG.). (Sub-kingd. Mollusca. Class Polyzoa. Order Infundi- 

 bulata. Sub-order Cheilostomata. Fam. Memhraniporidae.) 



Gen. Char. — Zoarium encrusting. Zocecia in longitudinal series, quadrate, separated by 

 raised lines ; lower part calcareous, convex, much projecting, smooth and imperforate ; aperture 

 occupying the whole width of the upper part, deep, membranous, with a narrow smooth lamina 

 below.] 



Description. — The zocecia are quadrate, separated by narrow raised margins; 

 the upper half is occupied by a membranous area, the membrane being- situated at a 

 considerable depth, with the flap-shaped mouth at the upper end; the lower half is 

 prominent, smooth, white, calcareous, rising- higher than the separating- margin. 

 The upper end of the zocecium is in the form of a broad shallow arch hollowed 

 out in the base of the prominent portion of that above. 



Reference. — Membranipora porccllana, P. H. MacGillivray, Trans. Roy. Soc. 

 Vict., Nov. 1884. 



Portland, Mr. Maplestone. 



Explanation of Figures. 



Plate 106. — Fig. 8, portion of specimen, magnified. Fig. 8a, small group of zooecia, more 

 highly magnified. 



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