300 Dr. T. Goodey on the 



1786. The correct name for the * Kleisteraelchen ' is thus 

 seen to be AnguiUula rediviva (Limigeus, 1767), Stiles and 

 Ilassall, 1905." 



Discussing the work of systematists succeeding Miiller, 

 the authors point out that Oken (1815) wrongly transferred 

 A. aceti and A. gluthds to tlie genus Uordlus. 



In 1828 Heniprich and Ehrenberg proposed AnguiUula as 

 a new genus, but did not include either aceti or gludnis in it. 

 Ten years later Eiirenberg (1838) included both aceti and 

 glutinis in the genus AnguiUula, but this was not MuUcr's 

 genus. 



Diijardin (1845) retained Anguilhda of Hemprich and 

 Ehrenberg for the species originally placed therein by them, 

 and transferred oceti and glutinis to the genus Rhahdilis. 



Diesing (1851) replaced aceii and glutinis in the geims 

 AnguiUula, whilst Baslian (1865) retained these species in 

 the genus, and definitely designated aceti as the type of 

 AnguiUula, "since," he says, "this appears to have been so 

 regarded by Ehrenberg." 



JStiles and Hassall show that Bastian was wrong in this, in 

 that aceii was not one of the species included under AnguiUula 

 by Hemprich and Ehrenberg in 1828. 



An important paper dealing with the genus AnguiUula is 

 that by Man (8). He retains and defines the genus, and 

 gives a detailed description of A. aceti, of a variety [A. aceti, 

 var. dryophila), and ot a new species {A. ludwigii). 



The paper is excellently illustrated, and has proved most 

 useful in the present investigation for purposes of comparison. 

 A discussion of some of the previous systematic work is 

 given, and it is shown that Schneider was not justified in 

 putting aceti and glutinis into the genus Leptodera. 



I quote Man's diagnosis of the genus AnguiUula : — 



" Body more or less slender, tapering at both ends, espe- 

 cially towards the hind end, where the tail is drawn out to a 

 fine jjoiiit. 



" Cuticle very finely striated with narrow lateral lines 

 and no bristles. 



" Excretory system present, opening in the vicinity of the 

 oesophageal bulb. 



" Head rounded or truncated ; lips present or absent, with 

 one or more circles of papillas. 



" Mouth small, with thin chitinous lips completely anterior. 

 In A. aceti the mouth-aperture leads into a chamber with 

 outwardly bent walls. This chamber is divided into two 

 parts lying behind each other. The hinder portion carries a 



