GENERAL SYSTEMATIC BACTERIOLOGY 35 



2. Cells rod shaped, in large numbers in a brown thick capsule. 



Cystobacter n. g. 

 III. Order: Desmobacteria. Long filaments, usually surrounded by a definite 

 sheath : 



A. Filaments unbranched Family Leptotrichacei Zopf. 



1. Filaments always non-motile. 



a. Filaments with very thin sheaths. Multiplication by falling 



apart into two segments Leptothrix Ktitzing 



b. With thick sheaths. Multiplication by spores and separation 



of single joints Crenothrix Cohn 



2. Filaments motile Beggiatoa Trevisan 



B. Filaments branched: 



1. Filaments not club shaped or thickened at end: 



a. Filaments free Cladothrix Cohn 



b. Filaments bound in bundle by slimy capsule. 



Sphaerotilus Kiitzing 



2. Filaments club thickened at end.. . .Actinomyces Harz. 



The new genera described were Lampropedia, Lamprocystis, Hyalo- 

 coccus, Leucocystis, Microspira and Cystobacter. 



Trevisan (1887) outlined the following classification of bacterial 

 genera. 



Trevisan's Classification of Bacteria (1887) 



1. Bacteriaceae trichogenae. Three stages of vegetative development. 

 1. Filaments (typical). 2. Rods. 3. Cocci. 



A. Filaments fixed, with base distinct from tip. 



(Lepiotrichieae) . 

 Genus 1. Cladothrix Cohn 

 Genus 2. Crenothrix Cohn 

 Genus 3. Sphaerotilus Kiitzing 

 Genus 4. Leptotrichia Trevis. (1879) 

 Genus 5. Beggiatoa Trevis. (1842) 

 Genus 6. Phragmidiothrix Engler (1881) 



B. Filaments free, no distinction between base and tip. 



1. Filaments spiral, not embedded in a mucous capsule. (Spirilleae). 



Genus 7. Kurthia. Trevis. (1885) 

 Genus 8. Vibrio Cohn (1872) 

 Genus 9. Spirillum Ehrenb. 

 Genus 10. Spirochaete Ehrenb. 



2. Filaments spiral, embedded in mucous capsule (Myconostoceae) . 



Genus 11. Myconostoc Cohn 



3. Filaments straight. (Zopfielleae). 



Genus 12. Zopfiella Trevisan (1885) 

 II. Bacteriaceae baculogenae. Three stages of vegetative development. 



1. Rods (tvpical). 2. Filaments (abnormal or transitory stage). 3. Cocci. 



