Zoology.-} NATURAL HISTORY OF VICTORIA. 



Plate 187, Figs. 1-3. 

 MEMBRANIPORELLA DLSTANS (McG.). 



[Genus MEMBRANIPORELLA (Smitt). (Sub-kingdom MoUusca. Class Polyzoa. Older 

 Infundibulata. Sub-order Cheilostomata. Family CribrilinidEe.) 



Gen. Char. — Zoarium adnate or foliaceous. Zooecia coDtiguous or disjunct ; front closed 

 by a series of flattened, more or less consolidated, calcareous ribs.] 



Description. — Zocecia contiguous or separated, oval or elongated; ribs 8-11 • 

 on each side, a thin raised line down the centre marking- the suture of the opposite 

 ribs; mouth with 2-6 thick, articulated spines. Oojcia rounded, with a depressed 

 area separated by a thick margin. 



E.EFERENCE. — P. H. MacGilllvraj, Trans. Roy. See. Vict., July, 1882. 



Port Phillip Heads ; Warrnambool, Mr. H. Watts. 



In young specimens the ribs are seen to bifurcate at the inner 

 extremities. At first they are separated by considerable intervals, 

 but, as growth and calcification advance, they become almost 

 contiguous. The oral spines are thick and occasionally almost 

 pod-like, the first pair frequently lai'ger. The ocecium has a large 

 depressed area in front bounded by a thickened ridge. The 

 ovicelligerous ceils have one pair of spines. In the first specimen 

 described the zooecia are separated by considerable distances, but 

 in others they are closely adjunct, although with a tendency to 

 spread at the edges of the zoarium. It is allied to the European 

 M. nitida,, from which it diflfers in the stouter spines and, especially, 

 in the structure of the ooecia. There ai'e no avicularia in my 

 specimens. 



Explanation of Figures. 



Plate IS". — Figs, 1 and 1«. zooecia from the disjunct form, young. Fig. 2, zooecia and 

 ooecia from an older and more calcified specimen. Fig. 2a, single ooecium. 



Plate 187, Figs. 3 and 4. 

 CRIBRILINA RADIATA (Moll. sp.). 



[Genus CRIBRILINA (Hincks). (Sub-kingdom MoUusca. Class Polyzoa. Order Infun- 

 dibulata. Sub-order Cheilostomata. Familj- CribriUnidae.) 



Qen. Char. — Zoarium encrusting, or adnate, or erect. Front of zooecia with radiating 

 furrows occupied by regular series of perforations, or irregularly pierced by lai'ge, more or less 

 rounded foramina ; mouth semicircular or subcircular, entire below.] 



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