38 R. E. BUCHANAN 



only one, the older, of the names should be kept in accordance with 

 Article 51, 4°." 



This last article reads: 



Every one should refuse to admit a name in the following cases: 

 4. When the group it designates embraces elements altogether in- 

 coherent, or when it becomes a permanent source of confusion or error. 



It would seem that there is ample justification in the code for 

 the recognition of Bacteridium Davaine. 



Subgenus 3. Astasia Meyer, 1898, p. 49 



Motile rods, spores ovoid with longitudinal striae, star-shaped in 

 cross section. 



The type species is Bacillus (Astasia) asterospora Meyer. 



Genus 2. Plectridium Fischer, 1895, p. 147 



Synonyms : 



Paraplectrum Fischer, 1895, p. 139 

 Plectrinium Fischer, 1895, p. 139 

 Plectrillum Fischer, 1895, -p. 139 

 Diplectridium Fischer, 1895, p. 140 

 Putribacillus Jensen, 1909a, p. 343 in part 

 Pectohacillus Jensen, 1909a, p. 343 in part 



Cells rod-shaped, straight or at least never spiral, motile by 

 diffuse flagella or non-motile. Endospores produced under favor- 

 able conditions, causing an enlargement of one tip of the cell, giving 

 rise to a drumstick appearance. Usually Gram-positive. An- 

 aerobic or microaerophilic. 



The type species is Plectridium tetani (Nicolaier) Fischer. 



Genus 3. Clostridium Prazmowski, 1880, p. 23 



Synonyms : 



Amylobacter Trecul, 1865, p. 435 

 Cornilia Trevisan, 1889, in part 



