Zoology. 1 NATURAL HISTORY OF VICTORIA. [Polt/zoa. 



Plate 59, Fig. 4. 



BICELLARIA CILIATA (Linn.). 



Description. — Cells very small ; outer margin with about 6 long slender 

 spines ; a small spine on the front of the cell immediately below the aperture, and 

 another a short distance down the back. Avicularia small, capitate, attached to the 

 outer part of a cell. Ovicells small, round, on the inner margin of the aperture. 



Reference. — Busk, Cat. Mar. Pol. Brit. Mus., p. 41, pi. xxxiv. 



QueensclifF ; Portland, Mr. Maplestone. 



Of the form now described I have only seen two or three small 

 fragments ; in all of them the spine in front is simple, and I can see 

 no difference between it and the European B. ciliata. Busk's B. 

 gracilis differs in the form of the cells, and in the presence of a 

 fine double spine in front. I had specimens with a double sj3ine 

 which I referred to it, but they have unfortunately been lost, and I 

 have no description or figure. 



Explanation of Figitres. 



Plate 59. — Fig. 4, specimen, natural size. Fig. 4a, front yiew, magnified. Fig. 46, back of 

 same. Fig. 4c, a single cell, more highly magnified, showing a small capitate avicularium. 



Plate 59, Fig. 5. 

 BICELLARIA TURBINATA (P. MacGil.). 



Description. — Cells turbinate, elongated, much contracted below, upper part 

 scarcely free ; aperture nearly circular, with 3 or 4 long submarginal spines from 

 the upper and outer margin. 



Reference. — P. H. MacGillivray, Trans. Roy. Soc. Vict., 1869. 



Queenscliff. 



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