SEA-FISHERIES LABORATORY. 149 
What is an Exclusively Faeca! Organism ? 
In the Lancashire Sea-Fisheries Laboratory Report for 
1914, I gave a list of some of the characters of organisms 
isolated from mussels. Since then this list has been extended, 
and the fuller details accumulated may be given here. The 
methods of identification of lactose-fermenting species evolved 
by McConkey have been utilised since, these seem to be the most 
useful and satisfactory. A source of incertitude experienced 
and the cases 
was the conclusive recognition of “ motility,” 
where this was doubtful are omitted. 
The sign + means the production of acid and gas in the 
medium, and the sign — indicates either no reaction at all 
or an incomplete one. In the case of the indole reaction, the 
Voges and Proskauer reaction, “ V. and P.,” and the motility 
observation, the symbols mean respectively a definite, positive 
reaction and no change. The numbers “ M. 71,” etc., in the 
first column relate to McConkey’s identifications.* In all cases 
the reaction to inulin was tried, but this was invariably negative 
so it has been omitted from the tables. 
*« Lactose fermenting organisms,’ Journal of Hygiene, Vol. LX, No. 1, 1909. 
