214 JOURNAL OF THE WASHINGTON ACADEMY OF SCIENCES VOL. 13, No. 10 
the body is wide, the strongly cutinized medium sized vagina extends inward 
at right angles to the ventral surface half the way across the body. From to- 
ward the ends of the valvular open- 
ing four muscles pass obliquely to 
the ventrally submedian regions 
of the body, two forward and 
two backward,—two to the right 
and two to the left. Furthermore 
there are two transverse valvular 
muscles attached near the ends 
of the opening and fanning out 
to the lateral parts of the body 
wall, one right and the other 
left, each partially encircling the 
intestine. Each of the two out- 
stretched uteri, about two body- 
widths long and about one-fourth 
as wide as the body, at its distal 
extremity presents a spermatheca 
three-fourths as wide as the body, 
sometimes containing what appear 
to be toward one hundred sausage 
it shaped sperm cells each some- 
Fia. 4. Lateral and ventral views of the tail end of the times having a bunch of chromo- 
male of Hoplolaimus coronatus n.sp. Treated with potas- 
sium hydrate to obliterate non-cutinized structures. somes at oneend. These sperma- 
theca are located at a distance 
from the vulva two or three times 
as great as the diameter of the body. In the late autumn they are a very uni- 
form feature of the adult females which have deposited no, or very few, eggs. 
As thus far seen, the slender outstretched ovaries are about one-fourth as wide 
as the body; both lie on the left side. They are narrow and somewhat cylin- 
droid and contain one hundred or more ova arranged somewhat irregularly. 
oy te tee 97.5 The male is like the female inform. The 
24 28 3.2 3.6 a2. U4 Spicula are colorless. A portion of the 
ii pent irae ; Ba gubernaculum lies ventrad,—(telamon of 
Hall). See Fig. 4. There are no preanal ventral supplementary male 
organs, and no ribs occur in the bursa. The striae of the bursa on the 
ventral side are less distinct near the ventral line. The terminal lobe of 
the bursa appears destitute of striation; if any striae are present they 
must be exceedingly fine. The vas deferens appears to be about one-half as 
wide asthe body. The narrow cylindroid testis tapers a little, and at the blind 
end is only one-fourth as wide as the body. The granular sperm cells seen in 
the vas deferens are about one-tenth as wide as the body; the spermatocytes, 
farther forward, one-eighth. ‘ 
Habitat: Found in soil immediately about a Mermis “nest,” (Agamermis 
decaudata), Four Mile Run, Falls Church, Va., U.S.A. Nov., 1922. 
The movements of this nema are very slow. The limber body readily takes 
on sharp sigmoid curves and is sometimes seen coiled; in fact the males can 
coil rather closely. From this amended characterization it seems evident 
the Hoplolaimus Daday (not of other authors) is a rather clearly marked 
genus. ‘The closest relative of Hoplolaimus is Dolichodorus Cobb 1914. 
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