PROSPECTS FOR A NATURAL SYSTEM OF CLASSIFICATION OF BACTERIA 



9. Veillonella Prevot, 1932. Emend.* 



Spherical cells, motility has not been observed. No endospores formed. Chemo- 

 heterotrophic, anaerobic, capable of fermenting protein decomposition pro- 

 ducts with the production of carbon dioxide, hydrogen, and other unknown 

 products. Gram-negative. 

 The type species is Veillonella parvula ( Veillon et Zuber) Prevot. 



10. Peptococcus nov. gen.** 



Spherical cells, either immotile or motile. No endospores formed. Chemo- 

 heterotrophic, anaerobic, capable of fermenting protein decomposition pro- 

 ducts. Gram-positive. 

 The type species is Peptococcus niger (Hall). 



1 1 . Methanococcus nov. gen. 



Spherical cells, occurring singly or in masses. Motility has not been observed. 

 No endospores formed. Ghemo-heterotrophic, anaerobic, fermenting various 

 organic compounds with the formation of methane. Gram-negative (?). 

 The type species to be assigned in the near future. 



V. Tribe Sarcineae 



1 . Thiopedia Winogradsky, 1 888. 



Spherical cells, occurring in regular tetrads which are often united to uni- 

 cellular layers. Motility has not been observed. No endospores formed. Photo- 

 autotrophic, containing a red to purple pigment complex. Normally reducing 

 carbon dioxide with the simultaneous oxidation of H 2 S or other inorganic 

 sulfur compounds. 

 The type species is Thiopedia rosea Winogradsky. 



2. Thiosarcina Winogradsky, 1888. 



Spherical cells in regular packets. No endospores formed. Photo-autotrophic. 

 containing a red to purple pigment complex. Normally reducing carbon diox- 

 ide with the simultaneous oxidation of FLS or other inorganic sulfur compounds. 

 The type species is Thiosarcina rosea (Schroeter) Winogradsky. 



3. Gaffkya Trevisan, 1885. 



Spherical cells often occurring in regular tetrads. Motility has not been ob- 

 served. No endospores formed. Chemo-heterotrophic, oxidizing various or- 

 ganic compounds. Gram-positive. 

 The type species is Gaffkya tetragena (Gaffky) Trevisan. 



4. Sarcina Goodsir, 1842. 



Spherical cells, often occurring in regular packets. No endospores formed. 

 Chemo-heterotrophic, oxidizing various organic compounds. Gram-positive. 

 The type species is Sarcina lutea Schroeter. 



* Cf. the previous note. 



** The various anaerobic, Gram-positive cocci placed by Prevot (I.e.) in the genera 

 Diplococcus, Gaffkya, Staphylococcus and Micrococcus might well be united in this genus, 

 as long as further particulars regarding their katabolism are lacking. 



323 



