GENERAL SYSTEMATIC BACTERIOLOGY 61 



I. Family I. Coccaceae: Vegetative cells spherical 



a. Subfamily, Allococcaceae: Division in three directions of space, 



no sharply marked growth form, short chains, masses, in twos 

 or singly: 



1. Non-motile Micrococcus Cohn 



2. Motile Planococcus Migula 



b. Subfamily Homococcaceae: with definite division sequence for each 



genus : 



1. Division in three directions of space, forming packets of cells. 



(a) Non-motile Sarcina Goodsir 



(b) Motile Planosarcina Migula 



2. Division in two directions of space, forming fours or plate- 



lets Pediococcus Lindner 



3. Division walls always parallel, grow in chains, pairs and 



singly, no plates or packets. .Streptococcus Billroth 



II. Family II. Bacillaceae: Vegetative cells cylindric, ellipsoid, oval, 



straight, during rapid multiplication, difficult to differentiate from 

 cocci. 



a. Subfamily Bacilleae: Spore forming rods unchanged, cylindric. 



Includes all forms not producing spores: 



1. Non-motile Bacillus Cohn 



2. Motile. 



(a) Monotrichous Bactrinium A. Fischer 



(b) Lophotrichous Bactrillum A. Fischer 



(c) Peritrichous Bactridium A. Fischer 



b. Subfamily Clostridieae : Spore forming rods, spindle shaped: 



1. Non-motile Paracloster A. Fischer 



2. Motile, peritrichous Clostridium Prazmowski 



c. Subfamily Plectridieae: Spore bearing rods, drumstick shaped: 



1. Non-motile Paraplectrum A. Fischer 



2. Motile, peritrichous Plectridium A. Fischer 



III. Family IH. Spirillaceae: Vegetative cells cylindric, but spiral. 



a. Slightly curved rods, motile, monotrichous 



Vibrio (Miiller-Loeffler) 



b. Decidedly spiral in broad turns, motile, lophotrichous. 



Spirillum Ehr. 



c. Very slender, many turns, flagella unknown, perhaps cell wall 



flexile Spirochaete Ehr. 



B. Order II. Trichobacterinae: Branched or unbranched cell filaments, whose 

 segments. are separated off as swarm cells (gonidia) or homogones. One 

 family: Trichobacteriaceae. 

 I. Non-motile^ rigid, enclosed in a sheath, 

 a. Unbranched: 



1. Without sulfur inclusions: 



(a) Not attached, cylindric gonidia, swarming. 



Chlamydothrix Migula 



(b) Attached, spherical gonidia not observed to be motile. 



Crenothrix Cohn 



2. With sulfur granules, attached. 



Thio'ihrix Winog. 



