90 MORPHOLOGY OF THE BACTERIA. 
into two, sometimes three to four articles, identical 
with the B. of charbon (Davaine). 
La B. glaireuse. 
Filaments extremely slender, straight or elbowed ; 
attaining 10 pw in length. 
La B. du vin tourné. 
Filaments very slender, of variable length, flexible, 
indistinctly articulated. 
La B. des infusions. 
Filaments of 10 to 20 w. In various infusions. 
g. Leptothrix, Ktz. 
The Leptothrix differ from Bacilli by their 
filaments being very long, adherent, very slen- 
der, and indistinctly articulated. 
Their forms are numerous. The following 
are the principal : — 
L. rigidula, Ktz. 
Length 100 to 150 yw, diameter 1.8 to 1.9m. In 
stagnant water, adherent to other vegetables. 
L. crespitosa, Ktz. 
Length 100 to 200 yw, diameter 2.4 to 2.8 u. Upon 
humid rocks. 
L. brevissima, Ktz. 
Length 75 to 100 yw, diameter 2.7 to 3.5 uw. In stag- 
nant water. 
L. pusilla, Rabh. 
Length 60 to 70 yw, diameter 0.5 to 0.6 uw. 
fp parasitica, Ktz. 
Length 90 to 150 yw, diameter 1 pu. 
L. radians Ktz., and L. spissa, Rabh. 
Parasites upon marine alge. 
