THE CLASSIFICATION OF BACTERIA 83 



*. Growth on gelatin thin bluish gray. 



33. M. concentricus Zimmerman. 

 2. Colonies not concentrically zoned. 



a. Growth on potato invisible, or very scanty. 



* From animal habitats, or pathogenic. 



34. M. cumulatus v. Besser. 



35. M. salivarius Biondi. 



36. M. beta. 



•* Terrestrial species ; in water, milk, etc. 



37. M. aquatilis Vaughan. 



38. M. tenacatis. 



39. M. acieii-lacitci (Lindntr) . 



40. Af. cerevisa (Balcke). 



b. Growth on potato abundant. 



* Gelatin colonies distinctly lobed. 



41. M . fervidosus KAaxaeXz. 



42. M. rosettaceus (Zimmerman). 

 •* Gelatin colonies not distinctly lobed. 



f Milk coagulated. 



43. M. ovalis Escherich. 

 tt Milk not coagulated. 



§ Potato cultures yellowish-brownish. 



44. M. lacHs. 



§§ Potato cultures whitish-grayish. 



45. M. candicans Flugge. 



46. M. nivalis. 



24. M. viticulosus FlUgge 



Die Mikroorganismen, 1886, 178. 



Morphohgy. Cocci oval, i. 0-1.2 /x; occur as zoogloea masses. 



Gelatin colonies. Deep colonies : Show a network of hairy ramifications, like 

 B. Zopfi, consisting of zooglcea. Surf ace colonies : Thin, cloudy, opaque, 

 whitish, from which fine threads penetrate into the gelatin. 



■Gelatin stab. Along line of puncture a villous-feathery growth ; on the sur- 

 face like surface colonies. 



Potato. A dirty white growth. 



Habitat. Air and water. 



