Fig 1. 



Fig 2. 



Fig. 4. 



Fig. 6. 



Fig. 3. 



Explanation of Plate. 

 Fig. 1. Male, sexually mature, very greatly enlarged. 

 Fig. 2. Galls produced upon roots of apples. 



Fig. 3. Cross-section through diseased root: a and h, female; c, dead cysts. 

 Fig. 4. Mature female cyst. 



Fig. 5. Anterior end of body: a, essertile spear; h. anterior part of oesophagus. 

 Fig. 6. Posterior end of body: a, caudal appendage; b. spicules. 

 Fig. 7. Sexually immature larva making its way througn cells of a potato tuber. 

 (All illustrations after G. F. Atkinson.) 



