F. I\. rETHERBllIDGE 511 



A large number of empty shells and a few living specimens of the 

 following: were found : , 



Ltmnaea jiereger Plamirbis iinthelliriiliis 



■•ilagnnlix ., corneus 



Plaiiorbis rorlex Bi/lhinia tcniaciilala 



Eelworms. The presence of eelworms was tested for by placing 

 small pieces of lean meat and mangold on the surface of the soil in the 

 laboratory and examini'ng at intervals. No eelworms were found. 



Earthworms. A few earthworms were found ir! the stackyards, 

 but none in the fields. 



Insects. Large numbers of bloodworms, the larvae of various 

 species of Chironomus, were found. These were present iu great 

 abundance all over the area. 



The only other insect found in the fields was a lai ••.';'. of a hovi'r -v- 



(Received Januanj '25th, 1916. 



CAMBRrOGE: PRINTED BY THE SYNDICS OF THE [WrVERSITY PRESS. 



