5^2 Microscopical Essays. 



Fig. 20 fhews it with it's fide towards the eye ; one of the 

 wheels in this pofition appears to lie confiderably below the 

 other. 



Fig. 6 and 16 reprefent two of thefe creatures in the poftures 

 they are often feen in when the wheels are not out, but the fiibril- 

 lae are vibrating quickly. 



Fig. 2, it is feen with the body nearly drawn into the abdomen ; 

 at Fig. 21 it is ftill further drawn in ; at Fig. 22 as it appears juft 

 as the tail is drawn in ; at Fig. 23 in a globular form, but ftill ad- 

 hering by the tail. 



Sometimes, when in the maggot form, it rolls it's head and 

 tail together, without drawing them into it's body ; it is repre- 

 fented in this ftate at Fig. 14. 



Mr. Baker has alfo defcribed three other fpecies, one of which, 

 that differs only from the preceding in having a very long tail, is 

 reprefented at Fig. 7, Plate XXVI. A. 



Fig. 1 1 is another kind, with cruftaceous fpiculse at the fore- 

 part ; within this, at c, an opake oval body may be feen, which 

 has been taken for an egg. 



Fig. 3 is another kind ; it has two projecting points from the 

 tail, and the head furnilhed with a number of fibrillar 



Fig. 



