MONTGOMERY: GORDIACEA. 45 
ones, varied in number in the two specimens sectioned. In the one, two 
nerves arise from the dorso-lateral margin of the ganglion, and may be traced 
cephalad for a number of sections ; they diverge only slightly; in the other 
specimen there is, in addition to the two lateral anterior nerves, also an un- 
paired median nerve of greater diameter than the other two, which bifurcates 
at its anterior end. The posterior nerves arise a couple of sections behind the 
anterior ones, and are two in number (one on each side of the median line), 
though in one of the specimens there appeared to be two on one side and one 
on the other; these posterior nerves pass caudad, diverging in their course, and 
may be traced into the lateral tail lobes, where they divide into still smaller 
nerves. 
In one male sectioned an elongated cuticular penis was present in the cloaca, 
this being only the second case of a penis being observed in a Gordiid, the other 
case having been observed by Vejdovsky. But the description of these inter- 
esting anatomical details must be postponed to a later paper. 
12. Paragordius varius (Leidy). 
Figs. 78-85, Plate 11; Figs. 86-93, Plate 12. 
Gordius varius Leidy, ’51, 756, 758. 
G. varius Leidy, Diesing, 1861. 
G. gratianopolensis Charvet, Schneider, ’66. 
G. varius Leidy, Villot, ’74. 
G. trilobus Villot, Oerley, ’81. 
G. varius Leidy, Camerano, ’93. 
Chordodes varius Leidy, Romer, ’96. 
(Leidy’s original type specimens have apparently not been preserved.) 
Form of the Female. The anterior and posterior portions of the body are 
narrower than the middle, the decrease in diameter being very gradual; the 
anterior is narrower than the posterior end. The head end (Figs. 83-85) is 
obliquely truncated in such a way that the antero-ventral margin projects 
farther forward than does the antero-dorsal; this truncated plane, which 
forms the terminal aspect of the head, is very nearly flat. The mouth lies 
near the ventral edge of the truncated plane. The posterior end (Figs. 88-90) 
is trilobed, there being one dorso-median and two latero-ventral lobes; these 
lobes have no cuticular spines on their surface, and in the great majority of the 
numerous specimens examined are of equal length. Two specimens in the 
Harvard collection were exceptions to this equality in length : in one the dorsal 
lobe was slightly longer than the others, in the other slightly shorter. But the 
dorsal lobe is narrower than the others, and further differs from the latter in 
having an elevated median ridge on its ventral surface, so that on cross section 
it appears triradiate (Figs. 80, 81). The lateral lobes are crescent-shaped on 
cross section. The cloacal aperture, wholly hidden by these lobes, lies at their 
base and between them, so that the cuticle and epidermis of the inner surface 
of the lobes are directly continuous with the cuticle and epithelium of the 
