THE CLASSIFICATION OF BACTERIA 343. 



ft Gelatin not liquefied. 



5. Spirillum undula (Mliller) Ehrenberg. 



6. Spirillum concentricum Kitasato. 

 b. Produce pigment on gelatin or agar. 



* On gelatin, growth yellowish. 



7. Spirillum tenue Ehrenberg. 

 ** On gelatin and agar, growth reddish. 



8. Spirillum rubrum v. Esmarch. 



2. Anaerobic; do not grow in the presence of atmospheric oxygen. 



9. Spirillum rugula (Miiller) Winter. 

 B. Do not grow in nutrient gelatin or other culture media. 



10. Spirillum sputigenum Kruse. 

 II. Cell plasma reddish. Thiospirillum Migula. 



A. Cells 3-3.5 microns thick and 10-40 long. 



11. Spirillum jenense (Ehrenberg) Winter. 



12. Spirillum sanguineum (Ehrenberg) Cohn. 



B. Cells scarcely exceed one micron in thickness. 



13. Spirillum rufum Perty. 



1. Spirillum volutans Ehrenberg 



Die Infusionstierchen als vollkommene Organismen, 1838. 



Morphology. Bacilli 2-3:13-30-50/01, ends slightly attenuated. Spirals of 

 2-5 elements, amplitude 10-15 fi. A polar bundle of flagella (Kutscher), 

 3-8. Dark granules in the interior of the rods, supposed to be of sulphur. 



Gelatin colonies. Coli-like. 



Agar colonies. Like diphtheria. 



Gelatin stab. Slight growth in depth ; on the surface, growth porcelain-white, 

 crumpled. 



Potato. Growth dry. 



Bouillon. Turbid ; no membrane. 



Habitat. Isolated from stagnant and marsh water. 



* 



2. Spirillum Massauah Kruse 



FIiigg e t Die Mikroorganismen, 1896, 589. 



Noted by Pasquale : Baumgarten's Jahresberichte, 1891, 336. 



Morphology . Bacilli similar to Msp. comma, with as many as 4 polar flagella. 

 Gelatin colonies. Completely round, entire, yellowish ; only a trace of lique- 

 faction. Indol produced in 24 hours in pepton solution. 



