MR. H. E. HURRELL ON THE POLYZOA IN NORFOLK WATERS. 199 
ing, but provide the zoological anatomist with a much better 
subject for manipulation than the marine forms. So far as 
my own research has gone, almost all the species figured by 
Allman in his grand monograph have been found by me 
within a twenty-mile radius of this room. 
My first experience of the Polyzoa was a hunt for Lophopus 
crystallinus in the river Yare near Brundall, and I am in- 
debted to Mr. Edward Corder of this city for giving a spur 
to my search for this beautiful polyzoon and to my study of 
the Polyzoa in general. 
Norwich naturalists have, as a matter of fact, contributed 
not a little to the popularity of the Polyzoa and to placing 
them in their proper niche in the science of Natural History. 
It was the late Mr. Brightwell of Norwich, and Mr. Wigham, 
who assisted Allman in the production of his masterly work 
by sending him material for examination ; and more recently 
Dr. Sidney F. Harmer has, by his contributions to the 
Cambridge Natural History, further added to Polyzoa lore. 
There is one British form that I have not yet found in 
Norfolk, and I have not yet come across a naturalist who has 
found it. I refer to Victor ella pavida, found in the Victoria 
Docks, London, many years ago, and repeatedly taken from 
the same waters since. It is a brackish-water variety, and 
said to be parasitic on the Hydroid Cordylophora form. 
I have gone over large masses of Cordylophora from time to 
time during the past ten years, but have never yet discovered 
it. It is a beautiful creature, and I shall be glad to hear of 
any one who may have found it in or near Norfolk. 
The two American species, Pectinatella and Urnatella, 
have not, so far as my information goes, been found in this 
country, and therefore will not be mentioned again to-night. 
I will, therefore, at once enumerate as precisely as I can the 
Norfolk habitats for the various forms : — 
Cristatella mucedo. 
Commencing with Cristatella mucedo, the only form that 
can reasonably be said to have the power of locomotion, 
I may say that it is a regular visitant to the waters of the 
river Yare between Postwick and Rockland. 
