NOMENCLATURE AND CLASSIFICATIONS. 173 



with Vibrio spirillum, a subsequent addition by Miiller, was removed by Ehrenberg 

 to form his genus Spirillum, which we still retain. The eel- worms were removed to 

 form the genus Angnillula, and the other infusoria were variously distributed. Only 

 UK- first two species of the original genus remained in Cohn's time, and neither one 

 was used by him. Cohn used Vibrio ntgitla, one of Miiller's additions, for the first 

 species under his emended genus Vibrio, but this has now been put by Migula into 

 Spirillum. The only other member of Cohn's genus Vibrio (emend.), V. set-pens, is 

 still less like the cholera organism. Ehrenberg's figure of I 'ibrio lineola Miiller 

 (Infusionsth.) shows crooked little organisms not unlike what we now call vibrios. 

 As a general proposition the writer believes that if a genus name is to be 

 retained one should be able to tie it to some definite type-species, and it ought to 

 be a species put into a genus when it was first published, and not one put in after 

 the genus has been emended out of all recognition. Of course, nothing can be 

 done with Miiller's, or Cohn's, genus description of Vibrio. If the name is to be 

 retained for any organisms whatsoever, the description must be made over and the 

 name anchored to a known species. Ordinarily such a name should be discarded. 

 Under the circumstances, we may perhaps strain a point, make over the genus 

 description in toto, and use the name Vibrio, as many pathologists have done, for 

 Koch's comma bacillus and related forms. Logically, perhaps, we should adopt the 

 strange Pacinia; for convenience sake we may continue to use the familiar Vibrio. 

 The name Vibrio is not used by helminthologists or algologists, and, if we connect 

 it to the first species described by Miiller under the genus, we may anchor the name 

 to any small motile species, withoiit fear that subsequent researches will require 

 changes to be made. This may be done, because the description of Miiller's Vibrio 

 lineola, the first species, is so imperfect that identification is out of question ; the 

 name can never be attached to any morphologically definite organism or group of 

 organisms different from the cholera vibrio, even the gelatinization of the water 

 after many days being probably enough due to other bacteria. The writer follows 

 Lafar (ist ed.), Alfred Fischer, Lehmaiin & Neumann, ct al., and would write : 



Vibrio (Miiller, Cohn, emend.).* 



Type of the genus, Koch's comma bacillus. 



Synonyms. Spirillum choleric-asialiar Koch; Microspira comma Schroeter; Pacinia 

 cholcra-asiaticce Trevisan . 



Kendall has criticized Migula's use of the word Pseudomonas on the ground 

 that he has combined under it two distinct groups of the family Bacteriacese, the 

 monotrichiate and the lophotrichiate forms, and because the name implies, he says, 

 a relation to " pseudomonads." The second criticism implies that to be tenable a 

 name must conform etymologically to all the facts in the case. This is a miscon- 

 ception. No one is warranted in setting aside a generic or specific name simply 

 because it seems inappropriate. It is not inappropriate, however, since the first 

 species in Miiller's genus Fionas was undoubtedly founded on small bacteria of 

 some sort. As to the first criticism, that lies also against my use of Bacterium and 

 requires a word. This criticism appears to me not well taken, since in the 

 BacteriaceEE, as Migula first pointed out, there is no such sharp distinction 



*According to Fischer, 1903, and Lehmann & Neumann, 1896, this emendation \vasmade by Loeffler. 



