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



in incinerated specimens. It also differs in the cavernous arrange- 

 ment of the plate, in its lighter color and greater thickness. This 

 and D. Wilsoni are at once distinguished from D. cellulosa and 

 grisea by the small size of the avicularium and the smooth margins 

 of fenestrse. 



Explanation of Figures. 



Fig. 2,— specimen, natural size. Fig. 2a, margin of fenestra and group of cells, with three 

 large cell-replacing avicularia, magnified. Fig. 26, cells from same group, more highly 

 magnified, showing three with avicularia, one with simple pore, and a large cell-replacing 

 avicularium. Fig. 2c, group of cells and large avicularium, incinerated. 



The specimens were presented by Mr. J. B. Wilson, and the 

 descriptions by Mr. MacGillivray. 



Frederick McCoy. 



Dec. VII. [ 25 ] 



