86 MORPHOLOGY OF THE BACTERIA. 



some phases of development of Clathrocystis roseo- 

 persicina of Cohn. Now Cohn is inclined to regard 

 the Monas vinosa, Ehrb. as the wandering cells of 

 Clathrocystis. On the other hand Warming has de- 

 scribed his : — 

 B. sulfuratum, Warming, 1876, giving it for synonymes, 

 Monas vinosa, Ehrb.; M. erubescens, Ehrb.; M. Warm- 

 ingii, Cohn; RTiabdomonas rosea, Cohn. It follows, 

 then, that the Monas which we have described with 

 the Spherobaeteria should be referred to a Bacterium 

 called sulphuratum by Warming, but which is also 

 identical with B. rubescens of Ray-Lankester. 



3. Desmobacteria. 



Filiform bacteria, composed of elongated cylin- 

 drical articles, isolated, or in chains more or less 

 extended, resulting from transverse division. Un- 

 der this form they correspond to leptothrix, Auct. 

 (differing from torula in that the filaments are not 

 constricted at the point of junction of the articu- 

 lations) ; filaments sometimes united in swarms, 

 never in zooglma. Movements and state of re- 

 pose alternating and depending upon the presence 

 or absence of oxygen, the reaction of the medium, 

 and other conditions unknown. Some forms never 

 exhibit movement. — Bacteridie of Davaine (Cohn). 



We will only preserve in the Desmobacteria the 

 genus Bacillus, Cohn. The vibrios are rather al- 

 lied to Spirillum because of their undulating fila- 

 ments. 



However, after the exposition of the different 

 species of Bacillus, we will say something of three 

 genera of colorless oscillatoriaceae, which are nearly 



