FAUNA OF THE CHESS AND GADF. 461 



Another occasion on which a large number of specimens of 

 Volvos was examined was on October 3rd, 1913, in water from a 

 small weedy pool near the southern end of Berkhamsted Common, 

 and close to a part of the golf course. Here, also, almost all 

 forms of life were apparently dead ; the water was of a purplish 

 colour, and, after inquiry, it seemed probable that worm-killing 

 fluid used on the course had found its way into the pool. 

 However, in one of the specimens of Volvox a P. parasita was 

 found. It was alive, but by no means lively, and when set free, 

 by rupturing the Volvox, did no more than extend and contract 

 itself by turns, the anterior parts of its body being decidedly 

 wrinkled at each contraction. On May 26th, 1914, an especially 

 fine specimen of Volvox from Chesham Eoad Pool was found to 

 contain a specimen of P. parasita. Strange to say, the contained 

 Eotifer was sluggish and the Volvox was quite motionless. A 

 few large and vigorous specimens of Volvox have been found 

 occasionally in the collecting bottles from other localities in the 

 district, but no specimen of P. parasita was detected. 



(To be continued.) 



