26 GENERAL SYSTEMATIC BACTERIOLOGY 



cc. Cells short cylindric, ellipsoid or fusiform. Multiplication by 

 division of the cells always in the same direction. 

 Genus 2. Bacterium 

 bb. Cells associated by an intercellular substance into regular mucous 



colonies Subtribe II. Sarcineae 



c. Cells globose, or when dividing ovoid, associated in tetrads in 

 tabular colonies, surrounded by a thick gelatinous tegument. 

 No common capsule about entire colony. 

 Genus 3. Sarcina 

 cc. Cells globose, or ovoid when dividing, associated in many layers 

 in dense colonies, surrounded by 1 to 4 gelatinous teguments. 

 No common tegument about entire colony. 



Genus 4. Chlamydatomus 

 ccc. Cells globose, associated in large numbers in globular colonies 

 without separate capsules. Colonies surrounded by a common 

 gelatino-cartilaginous tegument. 



Genus 5. Ascococcus 



aa. Pluricellular bacteria. Individuals composed of numerous cells frequently 

 in a filiform body. Spores in series within the cells. Cell division always 

 transverse. 



Tribe II. Vibrionieae 



h. Free, without branching. . . Subtribe I. Euvihrionieae 



c. Somatia fusiform or cylindric distinctly articulate, short, 



straight, isolated Genus 6. Maniegazzaea 



2c. Somatia cylindric, more or less distinctly articulate, slender, 

 short, straight, isolated. 



Genus 7. Metallacter 

 3c. Somatia cylindric, more or less distinctly articulate, slender, 

 elongate, filiform, straight, loosely fasciculate. 

 Genus 8. Leptotrichia 

 4c. Somatia cylindric, more or less distinctly articulate, elongate, 

 filiform, straight, loosely aggregated. 



Genus 9. Beggiatoa 

 '5c. Somatia cylindric, distinctly articulate, elongate, arcuate or 

 twisted, in masses, microgonidia formed from cells by repeated 

 transverse and longitudinal divisions, globulose, in dense masses 

 in a terminal pseudo-sporangium, escaping from the tip. 

 Genus 10. Crenothrix 

 6c. Somatia cylindric, articulate, short, undulate flexuose. 



Genus 11. Vibrio 

 7c. Somatia cylindric, articulate, short, rigid, spirally twisted. 



Genus 12. Spirillum 

 8c. Somatia cylindric, distinctly articulate, elongate, flexile, spiral. 



Genus 13. Spirochaete 

 9c. Somatia compressed like a blade, short, spirally twisted. 



Genus 14. Spiromonas 



