Zoology.-} NATURAL BISTORT OF VICTORIA. [Polyzoa. 



Plate IOC, Fig. 9. 



BIFLUSTRA PAPULIFERA (McG-.). 



[Genus BIFLUSTRA (D'Obbigny). (Sub-king. Mollusca. Class Polyzoa. Order 

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



Gen. Char. — Zoarium encrusting or erect, foliaceons or cellular, uni- or bi-laminar ; zooecia 

 depressed, elongated, separated by much raised, highly calcified, usually crenulated margins ; 

 aperture partially filled in below and occasionally on the sides bj a calcareous usually 

 granulated lamina, which generally slopes downwards from the margin] 



Description. — Zoarium encrusting - . Zooecia arranged in more or less regular, 

 contiguous lines, narrowed below, oval ; aperture very slightly rilled in below ; 

 margin thickened, strongly crenulated, the lower part raised into a rounded 

 prominence. 



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

 Vict., Dec. 1881. 



Port Phillip Heads, Mr. J. Bracebridge Wilson. 



Explanation of Figure. 

 Plate 106. — Fig. 9, group of zotecia, magnified. 



Platk 100, Fig. 10. 



BIFLUSTRA BIMAMILLATA (McG.). 



Description. — Zoarium encrusting. Zooecia elongated; aperture elliptical, the 

 edge formed by a tbickened, crenulated rim; the lower part of the aperture occupied 

 by a large plate or denticle sloping backwards and usually with a fissure or notch 

 on one side; front of the zocecium formed by a calcareous granulated lamina 

 sloping inwards to the aperture ; at the lower part of the zocecium are two rounded 

 prominences or mamillag, or occasionally only a single transversely elongated mass. 



Reference. — Membranipora bimamillala, P. II. MacGillivray, Trans. Roy. Soc. 

 Vict., Nov. 1884. 



The broad smooth plate at the lower part of the aperture is 

 evidently of the same nature as the serrated denticle of 

 B. delicatula. 



Explanation of Figure. 

 Plate 106. — Fig. 10, portion of specimen, magnified. 



The descriptions and type specimens illustrated by this plate 

 are from Mr. MacGillivray. 



Frederick McCoy. 



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