330 GENERAL SYSTEMATIC BACTERIOLOGY 



tions. May be pathogenic for the guinea-pig) producing oedema and gas, or 

 paralysis. 



Type species H. sextus {Bacillus VI of von Hibler), as described by von Hibler 

 (resume by Weinberg and Seguin, pi. 212). 



Von Hibler describes another species which he terms VII. These organisms 

 have much in common and we are probably justified in including them in one 

 genus as Hiblerillus sextus and Hiblerillus septimus. The latter resembles an 

 organism described by Tizzoni and Cattani, according to von Hibler. There are 

 probably many organisms in soil which are pathogenic for rabbits and guinea- 

 pigs when given certain conditions favorable to invasion, which rarely invade 

 under natural conditions or which on account of shj"^ growth habit are missed when 

 they invade in the company of other organisms. 



To this genus may be assigned two organisms isolated from the intestine of the 

 horse and described by Choukevitch (1911); they possess similar fermentative 

 ability: the production of acid and no gas in glucose agar. A non-pathogenic 

 one, Streptobarillus anaerobiciis-rectus may be termed H. rectus; another, H. 

 meaolosporus, produced a fibrino-purulent peritonitis in a guinea-pig. 



Hillhousia. A generic name proposed by West and Griffiths (1909, 

 p. 398) for a giant sulphur organism. The following summary taken 

 from their paper satisfactorily characterizes the genus. 



Hillhousia mirabilis is a sulfur bacterium of giant proportions, and is much the 

 largest solitary bacterium which has so far been discovered. Its average length 

 is about 60/x and breadth about 36^. 



The organism is a peritrichous bacterium with a large number of short cilia. 

 It occurs among decaying organic matter in the mud of shallow fresh water pools. 



Each individual contains a protoplasmic network in the wide meshes of which 

 large globules of sulfur (probably not pure, but in loose combination with proteid 

 material), are located. The network included numerous small granules, a con- 

 siderable proportion of which consist of some nucleo-proteid. None of them are 

 chromatin granules. 



The cell-wall is firm and has great powers of resistence to reagents. It is not 

 homogeneous, and 5 per cent carbolic acid demonstrates its lamellose character. 



The multiplication of the organism is relatively slow, one division occupying 

 upwards of twenty-four hours. 



The genus is recognized by Buchanan (1918, p. 463) as the third 

 in the family Achromatiaceae with the following description: 



Cells very large, 42 to 86 by 20 to 33/i, motile by means of peritrichous flagella. 

 Cells packed with large globules of oily amorphous sulphur. 

 The type species is Hillhousia mirabilis West and Griffiths. 



It is included by Bergey et at. (1923, p. 412) as the fourth genus of 

 Achromatiaceae. Borsa (1920, p. 231) concludes that this is a synonym 

 of Achromatium Schewiakoff. 



