Mr. Hancock on the Anatomy of the Freshwater Bryozoa. 173 
eated by the above reactions. They likewise show the presence 
of chloride of sodium, potash, sulphuric acid and magnesia. 
In comparing this secretion of the leaves of the Ice-plant with 
the fluid in the ascidia of Nepenthes, we find a material difference 
in their respective compositions, as will be seen by the annexed 
table, which exhibits the composition of both fluids. :— 
Composition of the fluid in the Composition of the watery secretion 
ascidia of Nepeuthes. of the leaves of Mesembryanthe- 
mum crystallinum. 
Organic matter, chiefly malic anda Organic matter (albumen, oxalic 
little citric acid. acid, &c.). 
Chloride of potassium. Chloride of sodium. 
Soda. Potash. 
Lime. Magnesia. 
Magnesia. Sulphuric acid. 
XVIII.—On the Anatomy of the Freshwater Bryozoa, with de- 
scriptions of three new Species. By Atpany Hancock, Esq.* 
[With four Plates. ] 
Durine a ramble made last July in company with “The Tyne- 
side Naturalists’ Field Club ” to the Northumberland lakes, I was 
fortunate enough to find two or three species of Bryozoa. Since 
then I have revisited the locality twice, and on each occasion 
additional species occurred. Thus six or seven forms of these 
interesting animals have been found to inhabit two of these 
lakes, namely Bromley Lough and Crag Lough. Three of the 
species appear to be undescribed ; these I propose to characterize 
towards the close of this communication, giving previously an 
account of the anatomy of the freshwater Bryozoa so far as I 
have been able to determine it. 
Amongst the known species was a fragment of Alcyonella, 
most probably A. stagnorum; but its characters could not be 
determined on account of the imperfection of the specimen. 
Fredericella sultana occurred abundantly and of very luxuriant 
growth, spreading over the under surface of stones in patches of 
three or four inches’ extent. Of the new species two belong to 
Plumatella and one to Paludicella, a rare genus, of which there 
was but one species previously known, and that I believe had 
been found only in Ireland, and in two or three localities on the 
continent. 
The anatomy of the freshwater Bryozoa had been very little 
studied on this side of the Channel before Professor Allman took 
up the subject, and he has handled it so well that little is left to 
— * Read at a Meeting of the Tyneside Naturalists’ Field Club, Dec. 1849. 
