Zoology.] NATURAL HISTORY OF VICTORIA. [Polyzoa. 



Zooecia arranged in distinct, irregular, radiating series, slightly rugose and thickly 

 punctate ; mouth oval or elliptical, with slightly thickened margin ; in the marginal 

 zocecia open, most of the inner closed by a punctate or perforated plate; towards 

 the centre are numerous rounded eminences, mostly at the commencement of series 

 of zocecia, and of the same width, punctate or perforated in the same manner, but 

 presenting no trace of mouth. Surrounding fringe consisting of a broad layer of 

 imperfectly developed zocecia, and the thin lamina beyond marked with slight, 

 radiating grooves, as occurs in the corresponding part of other species. 



Reference. — P. H. MacGillivray, Trans. Roy. Soc. Vict, Nov. 1884. 



Port Phillip Heads, Mr. J. Bracebridge Wilson. 

 I have only seen two specimens — the perfect one figured, and 

 another not so complete. 



Explanation of Figures. 

 Plate 147. — Fig. 3, specimen, natural size. Fig. 3a, the same magnified. 



Plate 147, Fig. 4. 

 DIASTOPORA SARNIENSIS (Norman). 



Description. — Zoarium thick, encrusting, and irregularly shaped, or partly free 

 at the margin. Zocecia large, distinct, arranged in irregular lines, a considerable 

 part free, especially in those towards the margin ; surface smooth or transversely 

 corrugated, thickly punctate, except in the peristome ; mouth circular or elliptical, 

 in many of those towards the centre closed by a calcareous plate, with a central, 

 raised, tubular opening. 



Reference. — Hincks, Brit. Mar. Polyzoa, p. 463, pi. lxvi., figs. 7-9. 



Port Phillip Heads. 



This species varies a good deal in size and shape. The zocecia 

 are thick, usually pretty prominent and free ; the curious cover 

 when present gives a ready means of distinction from the other 

 species. I have not seen the ocecia, but they are described by 

 Mr. Hincks as "transversely elongated, subelliptical inflations of 

 the zoarium, of considerable size." 



Explanation of Figures. 



Plate 147.— Fig. 4, specimen, natural size. Fig. 4a, portion magnified. Fig. 4b, portion 

 of same more highly magnified, showing the calcareous plates closing the orifices of several of 

 the zooecia. 



Vol. II.— Decade XV.— 2d. 181 ] 



