THE FAMILIES AND GENERA OF THE BACTERIA 205 



Family IV. Coccaceae Zopf 1884, p. 45, emended Migula 1894 



Synonyms: Sphaerobacteria Cohn 1872; Coccaceen Zopf 1884; Cocco- 

 genae Trevisan 1885; Coccacei Schroeter 1886; Coccobacteria Schroeter 

 1886; Sphaerobacteries Maggi 1886; Kokkaceen Hueppe 1886; Coccacees 

 Mace 1897. 



Cells in their free conditions, spherical; during division some- 

 what elliptical. Division in one, two or three planes. If the cells 

 remain in contact after division they are frequently flattened in 

 the plane of division, and form chains, packets or irregular masses. 

 Motility rare. Endospores absent. Metabolism complex, us- 

 ually involving the utilization of amino-acids or carbohydrates. 

 Pigment often produced. 



Tribe A. Neissereae, Nov. Trib. 



Strict parasites, failing to grow or growing very poorly on ar- 

 tificial media. Cells normally in pairs. Gram-negative. Growth 

 fairly abundant on serum media. 



Genus 1. Neisseria Trevisan 1885, p. 105 



Synonyms: Diplococcus Weichselbaum 1886 in part; Gonococcus? Neis- 

 ser? 1879; Merismopedia Zopf 1885; not Merismopedia Meyen 1839. 



Characters, those of tribe. 



Type species, N. gonorrhoeae Trevisan. 



Tribe B. Streptococceae Trevisan, 1889a, p. 1051 emended 



Parasites (thriving only or best on or in the animal body) ex- 

 cept genus Leuconostoc. Grow well under anaerobic conditions. 

 Many forms grow with difficulty on serum-free media, none 

 very abundantly. Planes of fission usually parallel, producing 

 pairs or short or long chains, never packets. Generally stain 

 by Gram. Produce acid but no gas in glucose and generally in 

 lactose broth. Pigment, if any, white or orange. 



