388 



folds kept open by incomplete rings, which differ from those in the 

 Blow-fly in being perfectly plain, instead of alternately forked at 

 either end. Two main channels on each side start from the base 

 of the mouth and take a sinuous course over the bladder-like 

 membrane ; from these a number of similar smaller channels 

 diverge at right angles, covering the whole surface, and forming 

 a fine strainer, through which the fluid element passes on its way 

 to the mouth. There are practically no mandibles, the only 

 traces of these organs being a pair of small, chitinous, hook-like 

 thickenings in the integument at the base of the lobes. 



September 19th, 1902. 



Mr. H. S. Martin : Longitudinal section (radial) of Pinm 

 sylvestris (Scotch Fir), showing bordered pits. 



Mr. C. F. Rousselet : Mounted specimen of the Rotifer, Notops 



hrachionus. 



Mr. J. T. Holder : Testis of Frog, showing spermatozoa. 



Mr. T. G. Kingsford : A Mite, known as the " Cotswold Bug," 

 and found in great quantities in the Cotswold Hills. Attacks 

 most animals, including man, burying itself in the skin after the 

 manner of the Harvest Bug. Colour, when living, a brilliant 

 orange. 



