Zoologt/.-\ NATURAL HISTORY OF VICTORIA. [Polyzoa. 



Port Phillip Heads. 



Readilj distinguished by the reniform, usually bulging plate 

 covering the zooecial pore, the transverse avicularium (occasionally 

 wanting), and the structure of the zooecium. In a variety of 

 M. ciliata from California the round zooecial pore is closed by a 

 finely cribriform plate. 



Explanation or Figure. 

 Plate 175. — Fig 6, portion of specimen, magnified. 



Plate 176, Fig. 7. 

 MICROPORELLA SCANDENS (McG.). 



Description. — Zocscia pyiiform, smooth ; mouth straight below, arched above; 

 four or six long', articulated oral spines; zooecial pore small and lunate. Ooecia 

 larg-e, rounded, upper edge, where adpressed to the zocecium above, slightly dentate. 



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



Port Phillip Heads. 



I have only seen a single small specimen, consisting of a chain 

 of eight zocecia, four surmounted by ooecia, running up a twig 

 of Biccllaria grandis. The habit of growth is not likely to be 

 constant, but it seems to lie a distinct species from any other 

 described form. 



Explanation of Figure. 

 Plate 175. — Fig. 7, portion of specimen, magnified. 



Plate 175, Figs. 8 and 9. 

 MICROPORELLA CILIATA (Linn. sp.). 



VARIETIES SPICATA AND PERSONATA. 



The cosmopolitan Micropo7-ella ciliata, already figured in 

 Plate 37, fig. 1, is a very variable species, but can always be 

 distinguished by the form of the mouth, the suboral pore, and 

 lateral avicularia. These last vary much. In Australian specimens 



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