NEMATODE DISEASE OF WHEAT. 
17 
phologically, the esophageal portion of the digestive system of the 
adult is not greatly different from that of the larva except as to 
size. Behind the posterior swelling of the esophagus, however, 
there are marked differences both in the 
intestine and the reproductive system of 
the adult as compared with those of the 
larva. In the young female the intestine, 
occuping a large part of the entire body 
cavity, becomes proportionately small as 
the reproductive system increases, so that 
in old individuals most of the body space 
is taken up by the egg-producing organ. 
The intestine is finally pressed closely 
against the body wall throughout its ante- 
rior half, while in the posterior portion it 
Fig. 5. — Lateral view of young female 1.95 
mm. in length. Camera-lucida drawing. 
X 95. For an explanation of the letters 
A to J, see figure 6. 
Pig. 6. — Ventral view of young 
male 1.36 mm. in length. 
Camera-lucida drawing mag- 
nified X 95. A, Spear; B* 
anterior esophageal bulb; (7, 
esophageal canal ; D, poste- 
rior esophageal bulb ; E> di- 
gestive system ; F, reproduc- 
tive system; Gr, spicula in 
male and vulva in female;; 
H, anus; I, bursa of male.; 
J, tail. 
gradually lessens in diameter and barely touches the wall. It 
contains at first granular bodies as well as liquids, and the entire 
contents appear yellowish brown in color. In old females, however^ 
151572°— 20 3 
