SPIRILLA 409 



SPIEILLUM AMYLIFERUM (Van Tieghem) 



Where Found. — In water. 



Microscopic Appearance.— Rigid filaments rolled up towards the right, 6 /t 

 long and from 1 to 1-5 ju broad, with from 2 to 4 spiral turns. It multiplies by- 

 division and spores. In the absence of air it acts as a vigorous ferment. 



SPIEILLUM PLICATILE (Ehrenberg) 



Authority. —Koch, Colin's Beitrdge zur Biologie d. Pflanzen, vol. ii. 



Where Found. — In stagnant waters, especially those containing living or 

 dead plants, or decomposing organic matter. 



Microscopic Appearance. — Very thin filaments with narrow spiral twists, 

 reaching sometimes 100 to 200 /i in length, and 0'5 (x broad, with rounded ends. 

 It is very motile. 



SPIRILLUM EUFDM 



Authority, — Perty, Zur Kenntniss Meinster Lebensfornien. Berne, 1852. 



Where Found. — In well-water. It forms on the surface of the sides of the 

 well red mucous spots varying in colour from rose-red to blood-red. (Rous, 

 loc. cit) 



Microscopic Appearance. — Forms filaments from 8 to 16 ;U long, slightly 

 reddish, with IJ to 4 spiral turns. It is very motile. It is not broken up 

 into segments. 



SPIEILLUM SEEPENS (Miiller) 



Where Found. — In stagnant water and putrefying liquids. 



Microscopic Appearance.— Thin filaments, often joined together in chains 

 from 11 to 28 /x long and from 0*8 to 1 li broad, with 3 to 4 fiattened spiral 

 turns. It is very motile. Sometimes it occurs in superficial flakes or pellicles, 

 in which it is bound together by mucous matter. 



SPIRILLUM TENUE (Ehrenberg) 



Where Found. — In stagnant water. 



Microscopic Appearance. — Filaments from 4 to 15 ^u in length, and about 

 0-4 fx broad, having 1 to 5 spiral turns very far apart. It is very motile. 



SPIEILLUM UNDULA (Miiller) 



Where Found. — Frequent in stagnant putrid water. 



Microscopic Appearance.— Filaments 8 to 16 /* in length, and about 1 to 1-5 /j. 

 broad, having 1 to 6 spiral turns. It is very motile, and has cilia. Forms 

 frequently coarse, mucous flakes. 



