32 
-j — [-) undeutliche Gliederung. [Here are given four species as doubtful, namely, 
“ B . ? enchelys E.,” “B. fpunctum E.,” 11 B. ? tremulans E.,” and “B. ? termo E.”] 
In his noted monograph JChrenberg (1838a, 75-77) again cites Bac- 
terium. He states that — 
ganz sicher ist nur eine Art der Gattung. Nur bei B. triloculare ist thierische wirk- 
liche Organisation beobachtet, indem sich ein wirbelnder Russel erkennen liess. 
Ausserdem ist kornige Triibung und die Selbsttheilung erkannt. Nur die, freilich 
sehr kraftige, offenbar freie, Bewegung ist ein alien Formen gemeinsamer thierischer 
Character. * * * Bacterium triloculare ist zuerst in der Oase des Jupiter Ammon 
in libyschen Africa, dann auch bei Berlin beobachtet, B. enchelys und punctual sind 
bisher nur in Petersburg gesehen. 
B. triloculare , the type of the genus, was first found in 1820 in 
swamp water in Africa. Later (1831) Ehrenberg found a similar form 
near Berlin, which he published as B. articulatum. In 1833 Ehrenberg 
again found this form in a glass of stagnant water in his room in Ber- 
lin, and he considered B. triloculare and B. articulatum as identical. 
He further observed a terminal flagellum on the organism ( u einen 
einfachen fadenartigen kurzen Russel ;*’) this was one-third to one-half 
as long as the body; “ die Bewegung der Thierchen war zitternd und 
um die Langsaxe langsam walzend." As doubtful species, Ehrenberg 
gives B. enchelys and B. punctum. 
As Ehrenberg, the author of both Bacterium triloculare and B. 
articulatum , concluded that these two supposedly distinct forms were 
in reality specifically identical, this conclusion should be accepted as 
correct until proved to be incorrect, and as he describes his type as 
possessing a terminal flagellum, Bacterium should be taken to possess 
this character. 
It is unnecessary to follow the genus further, in so far as a deter- 
mination of the type species is concerned, but it is interesting to note 
its later history. 
Dujardin (1811a, 212-216) retains the genus Bacterium with the 
following diagnosis: 
Corps filiforme, roide, devenant plus ou moins distinctement articule par suite 
d’une division spontanee imparfaite. Mouvement vacillant non ondulatoire. 
He cites the following species: 
1. B. termo (Muller); with the synonyms: Monas termo Muller, not Ehrenberg; 
Vibrio lineola Ehrenberg; this was not one of the original species. 
2. B. catenula new species. 
3. B. punctual Ehrenberg; synonyms: Monas puncturn? Muller; Melanella punctual ? 
Bory; Bacterium punctum? Ehrenberg. 
Bacterium triloculare or B. articulatum and B. f enchelys. 
Diesing (1850a, 11-16) describes Bacterium as — 
Corpus nudum, lorica destitutum hand mutabile, cylindricum subovatum aut sub- 
globosum, partitione imperfecta uniseriali, multiplici, transversain syntherium lineare, 
monili forme, rigidulum, rectum, hyalinum accrescens. Os * * * Flagellum in 
articulo primo terminate simplex. Ocellus' nullus. 
