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- 

 ingiii Cohn; Rhabdomonas rosea, Cohn. It follows, 

 then, that the Monas which we have described with 

 the Spherobacteria 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 zooglaa. 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 oscillatoriacece, which are nearly 



