GENERAL SYSTEMATIC BACTERIOLOGY 181 



general use. It is founded on a misconception of bacterial morphology, 

 has no named species, and has been abandoned by its author (1903). 

 It should be considered as invalid. It is rejected by Erwin F. Smith 

 (1905, p. 174). 



Arthrobakteriaceen. A variant of Arthrobaderiaceen. A name used 

 by Hueppe, (1886, p. 145) for a "Gattung" including the rod-shaped 

 bacteria which produce arthrospores or at least which do not produce 

 endospores. The " Untergattungen " included are Arthrobakteriurn 

 (Bakterium s. str.) and Spirulina (Proteus). The name is not Latin 

 in form. It must be regarded as untenable. 



Arthrobakterium. A spelling of Arthrobacterium De Bary (q.v.) 

 used by Hueppe (1886, p. 145) to designate an " Untergattung " of the 

 "Gattung" "Arthrobakteriaceen/' It is also given di'S, Bakterium sensu 

 strictu. It includes those straight rod shaped organisms which pro- 

 duce arthrospores, or at least do not produce endospores. 



Arthrokokkaceen. A name used by Hueppe (1886, p. 144) 

 for a "Gattung" of bacteria with spherical cells which produce arthro- 

 spores or whose method of spore production is unknown. The follow- 

 ing "Untergattungen" are included: Arthro-Streptokokkus, Leuconostoc, 

 Merista, Sarcina, Mikrokokkus, Askokokkus. It may be regarded as 

 invahd. 



Arthromitus. A generic name proposed by Leidy (1849, p. 227) 

 for two organisms found in the rectum of Julus. These he named 

 Arthromitus cristatus and A. nitidus. 



The following is the description given by Leidy to the genus and 

 to the first species described: 



Filaments always simple, cylindric, articulated, without ramuli, attached 

 by means of a nuclear bodj', and with no evidence of interior structure. 



Arthromitus cristatus. Filaments delicate, straight or inflected, growing in 

 tufts usually of moderate density, from minute, attached, yellowish rounded or 

 oval nuclear bodies. Articuli short, cylindric, uniform, measuring § 0*9 o^ inch 

 in length by "r^^^o^o^ in breadth, with no traces of interior structure. 



Length -^\^ to :fV inch, breadth y^Vo^T inch. 



Habitat. Same as Cladophijtum comatum, but rarely growing in such dense 

 tufts. 



Later (1852, p. 35) he described Arthromitus nitidus. This species 

 is described as follows: 



Filaments very long, hyaline, grows usually in twos or fours, pointed at the 

 origin, rounded at the termination. Articuli very distinct, length equal to the 

 breadth of the filament. Sporuli formed within the articuli solitary, usually 

 oblique, oval, amorphous. 



