Zoo/oyi/.] NATURAL HISTORY OF VICTORIA. [I'olyzaa. 



Plate 126, Figs. 1-2. 



MAPLESTONIA CLRRATA (McG.). 



[Geims MAPLESTONIA (McG.). (Sub-kingd. Mollusca. Class Poly zoa. Order In- 

 fundibulata. Sub-order Cheilostomata. Fam. Gellulariida?). 



Gen. Char. — Zoariura consisting of series of single or geminate zocecia, connected by distinct 

 corneous tubes. Zocecia with the front wholly occupied by a membranous area, or with the 

 lower part filled in ; imperforate behind. No aricularia or vibracula. Ooecium an inflation of 

 the posterior part of a zocecium.] 



Description. — Occurs in minute purplish tufts, the branches consisting- of series 

 of single and geminate zocecia, and curling inwards. In the single zocecia the front 

 is usually entirely membranous, the margins being thickened and bevelled inwards ; 

 in the geminate zocecia the lower part is generally filled in by the cell wall ; the 

 posterior surface is imperforate, and mostly marked by faint transverse lines. The 

 mode of branching is very irregular. In all cases of geminate zocecia each zocecium 

 gives origin to the first of a series, but in some cases two branches spring from the 

 summit of a single zocecium, or they may originate from its sides. The ooecium is 

 very peculiar ; the ovicelligerous zocecium is terminal, broad, very much enlarged 

 posteriorly, with a wide spout-like opening above the upper margin of the aperture. 



Reference. — P. H. MacGillivray, Trans. Roy. Soc. Vict., July 1881. 



Portland, Mr. Maplestone ; Warrnambool, Mr. Watts ; Port 

 Phillip Heads, Mr. J. B. Wilson. 



Explanation of Figures. 

 Plate 126. — Fig. 1, specimen, natural size. Fig. la, portion magnified, to show the anterior 

 surface of the zocecia and the mode of branching. Fig. \b, small portiou of the same, to show 

 the posterior surface. Fig. 2, ooecium. 



Plate 126, Fig. 3. 

 . SCRUPOCELLARIA CYCLOSTOMA (Busk). 



[Genus SCRUPOCELLARIA (Van Beneden). (Sub-kingd. Mollusca. Class Polyzoa. 

 Order Infundibulata. Sub-order Cheilostomata. Fam. Cellulariidas.) 



Gen, Char. — Zoarium usually jointed. Zocecia biserial, numerous in an internode ; aperture 

 large, rounded ; each zocecium with a sessile avicularium on the upper and outer angle, and, 

 occasionally, another, smaller, on the front : and a sinus posteriorly lodging a vibracular cell. 

 Ocecia superior, prominent. Radical tubes fixed to the base of the vibracular cells.] 



Description. — Zocecia usually aljout 7 in an internode, hroail ; aperture 

 occupying three-fourths of the front, nearly elliptical, slightly narrowed downwards, 

 with a narrow, clear, thickened margin, and destitute of scutum; a single or two 

 contiguous spines at the upper and outer part, one at the inner and two ahove. 

 Lateral avicularia of moderate size ; on each zocecium, immediately below the 

 aperture, a considerable avicularium with the mandible opening upwards and 

 forwards, on an elevated process. Vibracular cells large; vibracular setae short and 

 smooth. A single vibracular cell in the angle at a bifurcation. Radical tubes long 



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