(_For Description, see note[4], next page._)
]
Footnote 4:
FIG. 134.—The Beet Eelworm (_Heterodera Schachtii_): 1, A beet root
with adult females attached (natural size); 2, a lateral rootlet of
beet which Eelworm larvæ (_a_) are penetrating (enlarged); 3, a
lateral rootlet of beet with swelling (_a_) of the outer skin caused
by the excessive development of larvæ which have previously entered
it, and which have now become nearly mature females (enlarged); 4, a
just-hatched larva; 5, a larva which has penetrated a root and swollen
up into a club-shaped form; 6–8, development of the male; 9, a nearly
adult and, 10, an adult female. The following letters have reference
to Figs. 4–10: _a_, mouth spine,—_b_, sucking stomach (pharynx),—_c_,
_d_, intestine,—_e_, _f_, rectum,—_f_, anus,—_g_, excretory organ; _h_
(in Figs. 4–7), rudiments of the sexual organs in the undeveloped
larvæ; _h_ (in Fig. 8), testis; _i_ (in Figs. 7 and 8), copulatory
spicules of the male; _k_ (Figs. 9 and 10), ovary; _l_ (Figs. 9 and
10), female sexual opening; _m_, nerve ring; _w__{1} (Figs. 6–8),
larval skin; _w__{2} (Figs. 6–8), new skin which the developing male
forms within the larval skin. Figs. 4 and 5 are magnified more than
Figs. 6–10.