[ ^^ ] 



PLATE XL. 



F I G. L 



yORTICELLA POLYMORPH A. 



GENERIC CHARACTER. 



A Worm, capable of contracting or extending itfelf, naked, wkh 

 rotatory cilia. 



Many-ihaped Vorticella green, opaque. 



It is impoflible to defcribe the various forms thofe little Infe<Sls can 

 aflume ; and, from the microfcope, it is both doubtful and difEcult to 

 give a correal figure of it, as the aiSlivity of its motions and changes 

 frequently mifplace it from the verge of the focus. It is fcarcely per-= 

 Ceptible to the naked eye, and is generally of a green colour. 



F I G. IL 

 VORTICELLA ROTATORIA, 



SPECIFIC CHARACTER. 



Cylindrical Vorticella, with a little foot projedling from the neck 5 

 a long tail, furniflied v^ith four points. 



Of all the fpecies of minute Infeds, this V ortiqella feems to have 



sngaged the attention of the curious moft. Baker has defcribed 



C2 it 



