THE CLASSIFICATION OF BACTERIA 83 



b. 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. acidi-ladici (Lindner). 



40. M. cerevisa (Balcke). 

 b. Growth on potato abundant. 



* Gelatin colonies distinctly lobed. 



41. Af.fervidosusAda.metz. 



42. M. rosettaceus (Zimmerman). 

 **. Gelatin colonies not distinctly lobed. 

 f Milk coagulated. 



43. M. oz'alis Escherich. 

 ft Milk not coagulated. 



Potato cultures yellowish-brownish. 



44. M. lactis. 



Potato cultures whitish-grayish. 



45. M. candicans Fliigge. 



46. M. nivalis. 



24. M. viticulosus Fliigge 



Die Mikroorganismen, 1886, 178. 



Morphology. Cocci oval, 1. 0-1.2 /*; occur as zodgloea masses. 



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

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

 whitish, from which fine threads penetrate into the gelatin. 



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

 face like surface colonies. 



Potato. A dirty white growth. 



Habitat. Air and water. 



