ON A SPECIES OF CHATOSPIRA FOUND AT HODDESDON. 247 

envelope. You will observe that all or nearly all the cells are red, 
and that although under a high power (700 diameters) no connexion 
with the fungus can be perceived. ‘Therefore we have what the 
advocates of the theory declare a lichen to be, viz., an alga sur- 
rounded and imprisoned by a fungus, only it is in water instead 
of air. Probably further study would prove that the presence of 
the fungus was accidental, and that though the Protococcus is 
apparently healthy, it is not increasing by either of its known 
methods of growth. As this inquiry can be easily prosecuted by 
any one possessing a microscope with a j-inch objective, I hope 
some of you will try the exceedingly simple experiment detailed 
above, and if you can get as far as I have got, that you will en- 
deavour to induce the dual growth to flourish in air as well as 
water. I would also suggest that one phial be kept in the light and 
another in the dark, in order that we may find out whether that 
has anything to do with the fungal growth, or whether it is only a 
coincidence,—TZrans, Herts. Nat. Hist. Soc. 
ON A SPECIES OF CHTOSPIRA FOUND AT 
HODDESDON. 
By F. W. PHILLIPS, 
T the meeting held here in March, 1880, Mr. Henry Warner 
drew a rough sketch of an animalcule, and told me that he 
had found it many years ago in a pond at the Woodlands, Hoddes- 
don, but had never been able to identify it. .I saw at once that it 
corresponded with the drawing of Chetospira Miilleri given in the 
last edition of Pritchard’s ‘Infusoria.’ I had met with it about 
two years before, but unfortunately had given but little attention to 
it. I did not find it again until last October, and it was under the 
following circumstances. In July I placed ina polype-trough what 
I judged to be the empty ccencecium of a Polyzoon, and some 
Paludicelle, obtained from the same pond, leaving them there in 
the hope that statoblasts might be deposited ; about a month after I 
sent the trough and contents to Mr. Isaac Robinson. While it was 
in his possession some creature laid a number of eggs against the 
glass, and attention was from time to time directed to their develop- 
ment. One day Mr. Robinson reported the appearance of a 
strange creature adherent to this egg-case, which was now empty. 
The description of its movements convinced me that it was no other 
than the rather rare Chevospira ; and on examining it, I found that 
it was so, The animalcule, which was extremely small, had built 

