500 GENERAL SYSTEMATIC BACTERIOLOGY 



Apparently this name has not been used in a binomial, and is there- 

 fore invalid. 



Tetragenus. A name apparently first used as a pseudogeneric 

 designation by Kruse (1896, p. 94). As a binomial apparently it was 

 first used by Vincenzi (1897, p. 758) for an organism isolated from a 

 IjTuph node and named Tetragenus citreus. A second species Tetra- 

 genus tardissimus was named by Altana (1909, p. 44). 



If the first species (type) Tetragenus citreus Vincenzi is worthy of 

 of generic designation, the genus is valid. It probably is a sjmonym. 



Tetrakokkus. A variant spelling of Tetracoccus used by Ivlebs 

 (1887, p. 337) for the species Tetrakokkus variolae, the cause of variola. 



Thermoactinomyces. A genus described by Tsiklinsky (1899, p. 

 500) to include two species of thermophilic thread bacteria, Ther- 

 moactinomyces vulgaris and Th. lanuginosus. These organisms grow 

 at temperatures between 48° and 68°C. 



Morphologically these species do not differ from the soil species of 

 Actinomyces {q.v.), of which this name may be regarded as a synonym. 



The name is rejected bj^ Erwin F. Smith (1905, p. 174). 



According to Enlows (1920, p. 92) the type species is Thermoactin- 

 omyces vulgaris Tsiklinsky. 



Thermobacillus. A generic name proposed by Orla-Jensen (1909, 

 p. 33) to include thermophilic rod shaped bacteria, requiring as a 

 rule organic sources of nitrogen. The genus is included in the family 

 Alkalibacteriaceae and the order Perithricynae. The description given 

 by Jensen is as follows: 



Eigentiimlich, fur die aeroben Bacillen ist das grosz Temperaturintervall, 

 innerhalb dessen sie gedeihen konnen. Die Heubacillen z. B. wachsen zwischen 

 6-50°. Eine weitere Anpassung an die hoheren Temperaturen und damit Abge- 

 wohnung von den niedrigen flihrt zu den thermophilen Bakterien. Diese bilden 

 Sporen, welche hinsichtlich ihrer Widerstandsfahigkeit sogar diejenigen der 

 Kartoffelbacillen libertreffen. So erklart sich das Phanomen, dasz hochsterili- 

 sierte Milch, welche Wochen lang bei 35° unverandert blieb, bisweilen nach weni- 

 gen Tagen bei 70° gerinnt. Es ware vielleicht angezeigt, Thermobacillus als 

 selbstandige Gattung aufzustellen. 



Erwin F. Smith (1905, p. 174) includes Thermobacillus in a list of 

 rejected genera. A use of the name earlier than that of Jensen has 

 not been found. 



It is probable that this generic name is synonymous with Bacillus. 



Thermobacterium. Probably a misprint for Termobacterium. 

 Fuhrmann (1906, p. 8) refers to Thermobacterium aceti of Zeidler. 

 The name is listed as invalid by E. F. Smith (1905, p. 174). 



