36 BUREAU OF ANIMAL INDUSTRY. 



Later authors have overlooked the fact that Mueller's own writings 

 definitely fixed the type of Anguillula, as will be seen from the fol- 

 lowing complications which have arisen: 



Oken (1815) transferred aceti and glutinis to Gordius, leaving 

 fluviatilis and marina as the remaining original species of Anguillula, 

 and since marina is type of Enchelidium, 1836, jluviatilis, 1786 (equals 

 fluvialis, 1783), ought to have been taken as type (by elimination) of 

 Anguillula by any author who overlooked the facts given above rela- 

 tive to glutinis. 



In 1828, Hemprich & Ehrenberg proposed Anguillula as a new 

 genus, to contain the following species: 



Anguillula Hemprich & Ehrenberg, 1828, Phytozoa entozoa, not paged, as new 



genus, containing 5 species: 

 fluviatilis (Mueller, 1786) Hemprich & Ehrenberg, 1828, pi. 2, figs. 8, 13. $ 9 



Includes Vibrio fluiialis Mueller, 1783. 



inftexa Hemprich & Ehrenberg, 1828, pi. 1, fig. 12. Includes Vibrio niloticus. 

 coluber (Mueller, 1786) Hemprich & Ehrenberg, 1828. Sexes not given. 



Includes Vibrio coluber Mueller. 



recticauda Hemprich & Ehrenberg, 1828. Sexes not given. 

 dongalana Hemprich & Ehrenberg, 1828, pi. 1, fig. 13. 



Later, in discussing Vibrio, Ehrenberg (1838a, 82-83) gave the fol- 

 lowing species of Vibrio as members of the genus Anguillula: 



Anguillula aceti, including Vibrio aceti. 



A . glutinis, including Vibrio glutinis; V. ministerialis given as possible synonym. 



A. fluviatilis, including Vibrio anguillula, V. fluiialis, and V. lacustris. 



Vibrio agrostris Steinbuch. 



V. dongalanus. 



V. tritici Steinbuch. 



Dujardin (1845a, 239) pointed out that Anguillula Hemprich & 

 Ehrenberg, 1828a, differed in material characters from aceti and 

 glutinis. He preserved Enclielidium Ehrenberg, 1836, for Anguillula 

 marina; he also retained Anguillula for the five species mentioned by 

 Hemprich & Ehrenberg, 1828a; and he proposed RhaMitis to contain 

 R. terricola (designated type by Bastian), R. aceti ( Vibrio aceti), R. 

 tritici, all of which he examined, and R. glutinis ( Vibrio glutinis 

 equals Anguillula rediviva [type of Anguillula, 1786]), which he does 

 not state that he had examined, and which he was not aware was a 

 type. 



Thus, from our point of view, Dujardin used Anguillula in an 

 incorrect sense, namely, not in accordance with Mueller's writings. 

 Further, his Rhabditis, 1845, contained the type (glutinis) of an earlier 

 genus, and under ordinary circumstances this would be "type by inclu- 

 sion" for Rhabditis; but under the circumstances it is perhaps best 

 to accept Bastian's interpretation that terricola is type of Rhabditis. 

 (See p. 45.) 



