Zoolvgy.'] NATURAL HISTOUY OF VICTOHIA. {ruh/zoa. 



Forms handsome, whitish, or browuish-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 

 lara-e mouth is situated at or below the middle of 

 the cell, and in a separate compartment above this oft^slLv^ilrsbldtaroJ 



,1, 11 •n- ii ^ A_^ plate is itidistim-t. 



the large rounded oviceil 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 (Wtv. Thomson). (Sub-kingd. JloUusca. Class Polyzoa. Order 

 Infundibulata. Sub-Order Cheilostomata. Fam. Gemellariida;.) 



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 p.air 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, Dubhn 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 iind a portion sufficiently 

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

 and is similar to w^hat occurs in the Em-opean 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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