(about 334:yu) slightly in front of its caudal end. The measurements of 
the esophagus varj" in different specimens. No differentiation into the i 
dispharagus type was observed. A torsion of the esophagus is present. 
In its caudal half and at some other points the esophagus lies more or j 
less exactl}" in the middle axis of the bod}^, but portions of its anterior 1 
half may be decidedly excentric, nearing the dorsal surface of the worm. \ 
On section the outline is circular, but the lumen is seen to be triradiate, | 
each leg of the 3-rayed star measuring about 10 ju. The bod}- of the 
esophagus (figs. 5, 11) presents an exceedingly interesting arrangement 
of its component parts, but because of the poor condition of the 
material it is perhaps better not to attempt a definite interpretation at 
this time. It may, however, be stated that nuclei are visible at some 
points and that at other points there are structures which are indicative 
of nerves and of glands; further, that the component parts of the 
esophageal wall present an almost mathematically exact radial symme- 
try, the three chief fields of the s^mimetry being determined of course 
by the three legs of the triradiate lumen; finall}^, the component parts 
