256 JOURNAL OF THE WASHINGTON ACADEMY OF SCIENCES VOL. 13, No. 12 
There are two or three somewhat ellipsoidal organs, half as wide as the body, 
about two-thirds as wide as long, located just behind the base of the neck, and 
closely associated with the beginning of the intestine. These regularly darken 
in Flemming’s solution and are as yet of unknown significance. There is no 
cardia. The thick walled intestine, which is set off from the oesophagus by a 
rather faint cardiac collum one-half as wide as the base of the neck, presents a 
faint, though fairly capacious lumen. It is composed of cells of such a size 
that probably only about two are presented in each cross section. It becomes 
at once two-thirds as wide as the body. From the very inconspicuous, con- 
tinuous anus, the rectum, which is also very inconspicuous, extends inward 
and forward. There is no distinct pre-rectum. The numerous, colorless 
granules found in the cells of the intestine, the largest of which are about one- 
tenth as wide as the body, namely about two microns in diameter, are not so 
arranged as to give rise to a tessellated effect. Sometimes the cells throughout 
the intestine are uniformly filled with granules; more often the granules are 
absent here and there, so as to create a ‘“‘segmented”’ effect. 
The tail, which compasses about twenty annules of the cuticle, is conoid, 
subarcuate, and tapers from in front of the anus to the rather blunt, or some- 
times subacute, unarmed, symmetrical terminus. There is no spinneret. 
There are no caudal glands and there are no caudal setae. 
Apparently the lateral chords are about one- 
third as wide as the body. The rather prominent 
excretory pore is located just behind the nerve ring 
Ai Mi6) | __mscon 
and the excretory duct can be followed inward and .... . bas ost 
backward along the right lateral chord at least as diron (6) 
far as the middle of the body. Any 
The nerve ring is oblique, of medium size and ae 
accompanied, fore and aft, by numerous nerve cells, _ . - sub-eut 
some of which lie as far forward as opposite the jc on 
middle of the median oesophageal swelling. res” 
The single female sexual organ is outstretched _Albdsl on 
forward. From the unusually large, depressed and suai «ee 
very conspicuous vulva, the vagina, which is large, as gl sal ds] 
extends inward obliquely forward, three-fourths the tt 
distance across the body. Its walls are rather .... np gl sal ddl 
strongly cutinized. The larger anterior lip of the \ ab Lb med 
vulva may be slightly elevated. The body of the a mst bib med 
nema decreases a little in diameter rather suddenly 
at the vulva and tapers more rapidly thence back- 
ward. The thin-shelled, smooth, elongated egg is 
nearly thrice as long as the body is wide and meas- 
ures about 60x20 microns. Only one egg occurs in 
the uterus at atime. A prolate compact mass of 
sperm cells, often comprising some two to five hun- 
dred minute, spherical, refractive elements, occurs 
regularly in the uterus of newly adult females; this 
sperm mass is often two-thirds to three-fourths as 
wide as the body. From the formation and size of 
the sperm cells it is concluded that the species is 
syngonic. No males have been seen among about 
fifty females, many gravid, from two North Ameri- 
can regions. The medium sized ovary is usually 
cylindroid posteriorly, and tapers anteriorly ; it aver- 
ages to be about one-third as wide as the body. 
Toward fifty ova, arranged for the most part sin- jit bane pt ele 
gle file, are to be seen in the ovary. There is prac- 
tically no post-vulvar rudiment of a sexual’organ. 
