744 



THE MONTHLY BULLETIN. 



Fig. 394. — The common nematode or potato eelworni (Heterodera 

 radicicola Greef). 1, egg, magnified 200 time.s ; 2, sliowing develop- 

 ing lai-vte within ; 3, young larvfe magnified 200 time.s; 4, .same, mag- 

 nified 350 times; .5, adult female and gall magnified 70 times; 6, 

 same, opened showing organs of female and eggs and young larvte 

 as they are found in the gall ; 7, head of female, gieatly enlarged ; S, 

 part of egg tube, sliowing forming eggs ; 9, another part of tube with 

 a fully formed egg in it. a, alimentary canal; e, egg tube; h, head; 

 o, oesophagus; .s, siienr. (Oi-nwing liy Newcomer.) 



