394 Notes 



fond of the proglottides of Moniezia. I have shut both slugs up in 

 boxes with the lambs' faeces containing proglottides and have always 

 found that they devour the latter with avidity selecting them in 

 preference to the other food. They also eat Cittotaenia in the same 

 way. 



On June 5th, 1914, twelve AgrioUmax agrestis were collected and 

 put in a small tin at night with several Moniezia proglottides. In 

 the morning all had been eaten. On examining the faeces of the 

 slugs they were found to contain numerous Moniezia eggs having 

 apparently passed out with no alteration, some of the hexacanth 

 embryos being still alive. Examination was made of the slugs at 

 various intervals from two days to a month, by teasing up the tissues 

 and by sections. In no case could any trace of a larval Cestode be 

 discovered. Inside the alimentary canal were eggs, but only one 

 was found with the pyriform apparatus free from its outer shell and 

 the embryo itself was unaltered. 



It is not only when there is nothing else to eat that the slugs eat 

 the proglottides, for in a specimen of AgrioUmax agrestis found on the 

 fields at Leintwardine the stomach was full of Moniezia eggs. 



It is the same with Arion circumscrijptus. A specimen from Leint- 

 wardine also had its stomach full of eggs. One Arion Jiortensis was 

 put in a box with grass and a piece of Moniezia consisting of ten pro- 

 glottides. In half an hour at mid-day it had eaten the whole of this 

 piece. Examination of its faeces showed the eggs unchanged and 

 the embryos alive. The slug was sectionised and examined but no 

 trace of development of the embryo was found. Other specimens 

 gave similar results. 



A large mass of Moniezia was found in a field at Lower Shuckburgh, 

 Northants, and in it was a small Arion circumscriptns. It is evident 

 that the slugs seek out Moniezia to eat it. 



These slugs also eat Cittotaenia and are very fond of eating rabbits' 

 faeces. Both of these species are to be found in the fields devouring 

 the pellets, and their intestines are often full of the brown decaying 

 vegetation from these. Two Arion circumscri'ptus took half an hour 

 to eat one Ciiiof aewm-proglottis each, and four AgrioUmax agrestis 

 the same length of time. 



Eggs of both species of slug were hatched in earthenware pots 

 and the young fed with proglottides of Moniezia. and Cittotaenia. These 

 were examined at intervals but in no case could any development 

 of the embryos be seen. 



