GENERAL SYSTE3VLA.TIC BACTERIOLOGY 373 



cal respects some of these rods (Bacillus acidophilus) are closely related to the 

 true lactic acid bacteria, whereas others approach the Tetracocci or the aerobic 

 bacilli. 



The first mentioned species Microbaderium lacticum Orla- Jensen 

 is apparently to be regarded as the type. 



Micrococceae. A tribal name used by De Toni and Trevisan (1889, 

 p. 1067) with the following diagnosis: 



Cocci nudi, nee cystidibus, nee capsulis, nee vaginis obducti, liberi, nunquam 

 moniliformiter concatenati, raro gemini vel in turmas aut zoogloeas consociati. 

 Endosporae microsomae in coecis normalibus obvenientes. 



It is included in the family Coccogsnae. The following genera are 

 included: Neisseria, Staphylococcus, Micrococcus. 



Buchanan (1917, p. 613) recognized the tribe with the following 

 description: 



Saprophytes or facultative parasites. Usually grow best under aerobic con- 

 ditions. Grow well on artificial media, producing abundant surface growths. 

 Planes of fission often at right angles, cells aggregated in groups, packets or zoog- 

 loea masses. Generally Gram-negative. Usually pigmented yellow, orange or 

 red. 



He included the genera Micrococcus, Rhodococcus and Sarcina. 



Winslow et al. (Committee Soc. Am. Bact., 1917, p. 559, 1920, p. 

 207) have used practically the same description. 



It is also accepted by Castellani and Chalmers (1919, p. 925) with 

 the addition of the genus Nigrococcus, and by Bergey et al. (1923, p. 

 57) as the third tribe of the Coccaceae. 



Micrococcoglia. A name used by Billroth (1874, p. 14) to designate 

 a growth form of his Coccohacteria septica in which the spherical cells 

 were arranged in small zoogloeal masses. The name has apparently 

 not been used to designate a genus. 



Micrococcos. An aberrant form of spelling of Micrococcus used by 

 Billroth (1874, p. 6) to designate that growth form or stage in the 

 development of his Coccohacteria septica in which the organism con- 

 sisted of very small spherical cells. 



Micrococcus. This name was first used by HalUer (1866) to indi- 

 cate a growth form of a mold in accordance with his conception of 

 pleomorphism. He did not use the name in a generic sense, and the 

 genus should therefore not be ascribed to him, as has frequently been 

 done by various authors. Cohn (1872, p. 151) adopted the name and 

 defined it as a genus containing very small spherical or oval organisms. 



