658 SYSTEMATIC HISTORY OY THE INFUSORIA. 



dividing each division according as the animals composing it were loricated 

 or illoricated. 



The following table represents his classification : — 



Margin of ciliated wreath | loricated ... Ichthydina. 



With a simple continuous ^ ^ "'[Loricated CEcistina. 



wreath of cilia (Mono- -{ 



trocha) Margin of ciliated wreath f Illoricated . . . Megalotrochaea. 



lobed or notched (Schi- < 

 ^ zotrocha) [Loricated Flosculariaea. 



I' With the ciliated wreath [ Illoricated ... Hydatincea. 

 divided into several < 



With a compound or di- series (Poly trocha) \ Loricated Euclilanidota. 



vided wreath of cilia ■{ 



(Sorotrocha) With the ciliated wreath C Illoricated . . . Pliilodinsea. 



I divided into two series \ 



y (Zygotrocha) [ Loricated Brachionsea. 



N.B. This classification is given more at length at p. 478. 



Siebold adopts the classification of Ehrenberg for the Eotatoria, omitting a 

 few genera. Dujardin, on the contrary, regards the principles employed by 

 the great Prussian microscopist in framing his division of these animals as 

 faulty and uncertain ; consequently he puts forth a classification of his own, 

 substituting the name of Systolides for the better known one of Eotatoria. 

 He admits four primary divisions of the class, viz. — 



1. Those Eotatoria which live fixed to some foreign body by their posterior 

 extremity. 



2. Those which employ but one means of locomotion, using their vibratile 

 ciha as instruments, and being always swimmers. 



3. Those which exhibit two modes of progression, viz. smmming and 

 crawling, after the manner of leeches. 



4. Those which creep by imcini, and are destitute of vibratile cilia. 



The first of these groups includes only his Flosculariens and Mehcertiens. 

 The second contains by far the largest number, and is subdivided into two 

 secondary groups, in one of which the animals have an integument whoUy 

 flexible, whilst in the other they have some part of it solid, constituting a 

 lorica or shield. The thii^d section contains only his family of Eotifera, 

 closely corresponding with Ehrenberg's family of Philodinaea ; whilst the last 

 comprehends the Tardigrada. These curious animals are now kno^Ti to have 

 no affinity with the Eotatoria, but belong to the Arachnida, or class of spiders. 

 Indeed, at the time of publishing his book, Dujardin expressed doubts as to 

 the propriety of uniting them mth the Eotatoria. 



Leydig proposes a new classification of the Eotatoria, or as he terms them, 

 in accordance with his views respecting their nature, Cilio-crustacea, which 

 he arranges " according to their fonns — whether they are cyUndrico-conical, 

 sacciform, or compressed, together with which, as further characters, the 

 condition, presence, or absence of the foot may be employed." 



He adopts three primary divisions : — 



A. Figure between clavate and cylindiical. 



B. „ sacciform. 



C. „ compressed. 



