M. ANANTARAMAN                        117

and transversely striated, and the lumen is narrow and triradiate. The
general appearance of the œsophagus is that of a club-shaped organ.

[NLS note: a graphic appears here - see image of page]

FIG. 14. Fourth-stage larva from a nodule, showing cupoliform monodonted buccal
          capsule, claviform œsophagus, genital rudiment, and cervical vesicle in
          formation. The tapering tail is indicative of the female sex.

The intestine is conspicuous by its dark colour and by its length of 1.84
mm. and breadth of 0.08 mm. The wall is somewhat thick and the cavity
wavy and irregular. Posteriorly, it gradually narrows and joins the rectum,
running as usual at a tangent towards the ventral body-wall. Where the
rectum is joined to the intestine is the pair of rectal ligaments. The anus
is a perforation in the middle of a slightly elevated region of the cuticle.

The cuticle is thick and ringed. For the first occasion in the evolution
of the larva, the cuticle in the œsophageal region is inflated to a small degree,
0.18 mm. from the oral end, to form a small bulbous structure on the ventral
side and a much smaller sac dorsally in the same transverse plane. There is
a sharp furrow behind this inflation known as the cervico-ventral groove which
is distinctly recognizable on the ventral side. On each side, behind the cervico-
ventral groove and near the nerve-ring is a protuberance of the cuticle the