Zoology.-] NATURAL HISTORY OF VICTORIA. IPolyzoa. 



Hobson's Bay and Port Phillip Heads, on algfe shells and 

 zoophytes, probably common in other localities also. Differs from 

 H. divaricata in the zooecia beina; much smaller and narrower and 

 the connecting tulies being very long and slender. The zooecia are 

 usually much elongated, narrow, and smooth, or very fiiiutly 

 striated, and are frequently carinate. The anterior extremity of 

 the zooecium sometimes projects slightly forwards. The mouth is 

 small, narrowed below into an inconspicuous sinus and has a 

 narrow peristome. In addition to the fibres from the end, very 

 frequently one arises from each side of a zooecium. 



This species and H. divaricata are very closely allied, differing 

 chiefly in the zooecia of the present species being much smaller, 

 narrower, and more elongated, and in the connecting tubes being 

 very long and thin. The ooecium is similar to that of //. divari- 

 cata^ except that it is smaller. 



There can be no doubt that H. flagellum of Manzoni, Hincks in 

 British Marine Polyzoa, and Busk in the " Challenger " Polyzoa, is 

 the same as the present species, an identification which has already 

 been made by Hincks. Both Hincks and Busk describe and figure 

 the zooecia as smooth and destitute of carina, but in Mauzoni's 

 figure of H. flagellum they are distinctly carinate. 



Explanation of FionRES. 



Plate 187. — Fig. 10, portion of specimen on shell. Figs. 11, 12, and 13, zooecia from 

 another specimen on an alga. One zocecium is very sharply carinate, another strongly annulate, 

 whilst the ovicelligerous one is nearly smooth. 



Plate 187, Fio. 14. 

 ELECTRA AMPLECTENS (Hincks sr.). 



[Genus ELECTRA (Lamouroux). (Sub-ldngdom Mollusca. Class Polyzoa. OrJer In- 

 fundibulata. Sub-order Cheilostomata. Family MenibraniporidiB.) 



Gen. Char. — Zoarium encrusting, or filiform and erect, or foliaccous. Zooecia elongated, 

 narrow below, closely adherent together, lower part convex ; area oval or rounded, occupying 

 the whole width of the zooecium above, deep, with thiclcened margins ; one or more large, whip- 

 lilce spines (occasionally replaced by an avicularium) below tlic margin of the area, and a 

 variable number of short, sharp .spines on its circumference.] 



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