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



Forms handsome, whitish, or brownish-white curling tufts. The 

 cells are very large, with a thick margin, the upper and outer 

 angles of which form sharp conical processes ; mouth arched above 

 and straight below. The ovicells are very peculiarly situated. At 

 certain bifurcations, a cell is intercalated between 

 the two ordinary ones of a pair ; it is pyriform and 

 slightly anterior, with the upper extremity produced 

 into a process directed upwards and forwards ; the 

 large mouth is situated at or below the middle of 

 the cell, and in a separate compartment above this i K D^X^^lJiToi 



.11 i i • 1 1 ,i lil plate is indistinct. 



the large rounded ovicell is seen through the 

 membrane. 



Explanation of Figures. 



Plate 46. — Fig. 6, specimen, of natural size. Fig. 6a, portion, magnified, showing arrange- 

 ment of cells, bifurcation, and ovicells. 



Plate 46, Fig. 7. 

 CALWELLIA BICORNIS (Wyv. Thomson). 



[Genus CALWELLIA (Wyv. Thomson). (Sub-kingd. Mollusca. Class Polyzoa. Order 

 Infundibulata. Sub-Order Cheilostomata. Fam. Gemellariidas.) 



Gen. Char. — Cells joined back to back, each pair at right angles to those above and below ; 

 the cells of each pair connected by tubes with the pair next but one below ; cells at a bifurca- 

 tion not disjunct, and each giving origin to the first pair of a branch.] 



Description. — The only species. 



Reference. — Wyville Thomson, Dublin Natural Hist. Review, April 1858. 



Queenscliff. 



Of this species, I have only seen a few small fragments growing 

 on other polyzoa, and it was difficult to find a portion sufficiently 

 perfect for illustration. The connection of the cells is very peculiar, 

 and is similar to what occurs in the European Notamia bursaria. 

 Each pair of cells is connected with the next but one below by 

 tubes, which pass round and in the hollow between the cells of the 



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