56 



EELWORMS. 



digesting- stomach ; H. schachiii, also in its larval form, only a 

 sucking-stomach. 



The above distinctions, which are very clear when placed thus by 

 an expert before only partially qualified observers like myself, may 

 probably assist others in the intricacies of identification of this very 

 involved Nematoid presence. 



The above consideratiom, it will be seen, refer to the presence in 

 the Hop-roots of the Stem Eelworm, the T. dcvastatrix, and distinctions 



Heteroderv sciiaciitii. — Newly-hatched larva; male in case; citron shaped 

 female : all greatly magnified from figures, p. 760 of ' Tierische Schiidlinge und 

 Niitzlinge,' by Dr. Eitzema Bos. Females at Hop-roots, and eggs, magnified from 

 life by Ed. 



between this and the " Beet-root " Eelworm, the JI. schachtli, in some 

 of the stages in which this last much resembles the former ; the 

 follou-imj notes refer to the H. schacJitii, which (though much more 

 likely than not long present here) has not, as far as I am aware, ever 

 been previously recorded as found in England, until observed in the 

 past season by Prof. Percival. 



The Eelworm ivhich ice now know as the Hcterodera schachtli was 

 discovered by Schacht at the roots of young Beet-plants in 1859, and 

 later on (in 1871) this species was described and named by Schmidt 

 after its original observer. From being first observed (and also from 

 its prevalence) at Beet-roots, it has received the name of Beet Eel- 

 worm ; but it is to be found at the roots of many other kinds of 

 plants, as of Cabbage, Mustard, and some other cruciferous plants, 

 including the Wild Charlock ; Mangolds as well as the Sugar Beet ; 



