344 THE ZOOLOGIST. 



21. Triarthra longiseta, Ehren. — Specimens of this Rotifer 

 can almost always be obtained by dredging the deeper parts of 

 Chipperfield Common Pool ; on one occasion, April 13th, 1914, 

 no specimens were obtained, but this is the only record I have 

 of failure to obtain T. longiseta, and it may be said that the 

 pool presented a peculiarly lifeless aspect on the date mentioned, 

 and very few forms of life of any kind were obtained from it. 

 On August 4th, 1913, many specimens were obtained, and one 

 of them was carrying an oval egg near the hinder end of its 

 bag-shaped body. The two small red eye-spots near the oral 

 end were clearly seen, and the three long oar-like processes 

 were very conspicuous. The Rotifers often swam rapidly 

 forwards, and at the same time turned about their long axes. 

 Sometimes they darted suddenly across the field of view, or even 

 quite out of it. This sudden movement seemed to be due mainly 

 to the action of the two lateral processes, but the movement was 

 always so sudden and swift that I could never decide what really 

 happened, or to what extent the median process assisted. When 

 the Rotifers were swimming about steadily, the processes, either 

 the two lateral ones or all three, were swung forwards and 

 brandished vigorously. By far the greatest number of speci- 

 mens obtained at one time was dredged from beneath the ice, on 

 January 27th, 1914, and very many of them were carrying 

 eggs. 



22. Furcidaria molaris, Gosse. — Between the beautifully 

 situated little village of Ashley Green and Chesham are several 



small pools, and in one of these, near the Chesham 

 Road, not far from ' The Thorn,' was found, on 

 March 11th, 1913, a single specimen of F. molaris. 

 The Rotifer was first detected creeping along a 

 specimen of Daplinia pulex. Its main distinctive 

 features were very clearly seen : its stout, some- 

 what oval body and thick truncated head ; its long 

 jointed foot, ending in two rather long, divergent, 

 blade-like toes ; its bright red eye-spot, and its 

 large alimentary canal filling its body cavity to a 

 large extent ; several parts of the alimentary canal 

 were of a brown colour. No attempt was made to 

 draw the Rotifer until it had been narcotized, for it was quite 



