Zoology.'] NATURAL HISTORY OF VICTORIA. [Polyzoa. 



large, granular, with a hooded extension across lower lip of fertile 

 zooecium, the lower part frequently obscuring the pore which is 

 external to it. 



Variety thyreophora (Busk). Zooecium with a scutiform area 

 of variable size marked off in front, usually a row of stellate puncta 

 on each side of this area and a transverse row immediately below 

 the lower lip ; occasionally a double row on each side of the area ; 

 the lower part of the zooecium without puncta. Ocecia usually 

 large and entire, but at other times of moderate size and dentate, 

 as in the figure. It. is described as a distinct species by Busk 

 (Quart. Journ. Mic. Science, v. 172, pi. xv., figs. 4, 5) and as a 

 variety by Hincks (Brit. Mar. Pol., p. 212). 



Explanation of Figures. 

 Plate 175. — Fig. 10, Microporella Malusii, yarietj personata. Fig. II, variety thyreophora. 



Plate 175, Fio. 12. 

 ESCHARIPORA STELLATA (Smitt). 



[Genus ESCHARIPORA (Smitt). (Sub-kingdom Mollusca Class Polyzoa. Order 

 Infundibulata. Sub-order Cheilostomata. Family Microporellidse.) 



Gen. Char, — Zoarium encrusting. Mouth arched above, straiglit below ; several stellate 

 zooecial pores on the front of the zooecia. Avicularian mandibles without projecting articular 

 processes.] 



Description. — Zoarium encrusting. Zooecia distinct, broadly oval; surface 

 with numerous stellate zocecial pores; mouth nearly straight below, thickened and 

 arched above. A sessile avicularium at each angle of the mouth, the mandible 

 directed upwards and inwards ; usually a third avicularium above the mouth with 

 the mandible directed downwards. 



References. — Escharipora stellata, Smitt, Floridan Bryozoa, pt. ii., p. 26., 

 pi. vi., fig. 130-133; Microporella stellata, P. H. MacGillivray, Tr. Roy. Soc. Vict., 

 July, 1880. 



Port Phillip Heads, Mr. J. Bracebridge Wilson. 



Forms very pretty silvery zoaria. The pores in youug specimens 

 pierce the centres of thin rounded eminences. As age advances 

 the pores become depressed owing to the deposition of calcareous 

 matter between them. The supra-oral avicularium is not always 

 present. I have not seen ooecia. 



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