JOURNAL 



OF THE 



ROYAL MICROSCOPICAL SOCIETY. 



OCTOBER, 1914. 



NOTE. 



Note on Sph&rotilus. 

 By E. Moore Mumford. 



Since I understand from correspondence received by me that certain 

 misconceptions have arisen with regard to my communication to 

 the Society on Sphserotilus, I should like to communicate the 

 following amplification. 



Although I gave the diameter of the cells of the Sphserotilus 

 described as 4-0 • 6 fi, I do not regard this as rigid or typical, 

 since many observers have reported the cells as from 1-2 fi, and I 

 am of the opinion with regard to these organisms that the size is 

 extremely variable, but that a general morphological resemblance 

 persists throughout the group. In the plate the Sphmrotilus observed 

 by Mr. Haigh Johnson, I am informed by him, has a cell diameter 

 of about 2 /j, ; Cladothrix dichotoma, observed by Ellis, is described 

 as 1-1 • 5 fi ; and Mr. Johnson desires me to state this dimension, 

 which I have pleasure in doing. 



Oct. 21st.. 191 A 2 G 



