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of 165 fi from the tip of the tail, — which — considering the small size of the male
— will be relatively a great deal more than in the female.
The tail of the male has the shape of a cork-screw as is generally the case in
all the species belonging to the genus in question. The windings are distinct although
not so marked as may sometimes be observed. The bursa has a rather considerable
size. In a male of average size (c. V^h ctm.) the bursa has a length of 462 n and a
maximal width of 170^, measured from one edge to the other. Its shape is asymet-
rical which is no uncommon faet in these nematodes; this, however, not only ap-
plies to the exterior shape of the bursa, it also may affect the placing and relative
size of the papillæ on both sides, as well as the mutual size and shape of the spicules.
Even Schneider describes this. ^)
"Bursa und Papillen sind bei einer grossen Zahl von Species asymmetrisch gebildet
und gesteilt. Die eine Seite der Bursa ist långer und breiter, zugleich riicken die auf
derselben stehenden Papillen weiter nach vorne und aus einander. Die Spicula sind
immer ungleich und bei den verschiedenen Species von sehr verschiedener Ge-
stalt." —
In the species concerned one side of the bursa very distinctly appears to be nearly
^/s shorter than the other side, the measure mentioned (462 fj) thus applies to the
longer one. The bursa, on the wliole, has a longish oval shape with a distinct con-
striction on the middle, somewhat more pronounced on the longer side and placed
more caudally on the shorter side. The lower convexity is somewhat more distinct
on the longer side. Towards the tip of the tail the bursa narrows very consider-
ably, the side edges approaching each other. Almost in front of the hindmost set of
papillæ a small dilatation is observed after which the lips converge to a small rounded
lingulate tip, reaching c. 14 n outside the tip of the tail.
Besides the 4 preanal papillæ constantly present in the genus of Spiroptera 4 post-
anal papillæ are found on each side. They are all equally shaped, most slender on their
point of fixation to the bursa, and evenly increasing in width; the outermost part form-
ing a headshaped or rather discoidal dilatation. The 4 preanal papillæ almost have the
same size; they are bigger than the postanal papillæ and measure c. 20// in length.
Among the postanal papillæ the set next to the anogenital duet is the largest, after
which they gradually decrease in size, rendering those proximate to the tip of the tail
only c. 10 // in length.
As already mentioned a distinct asymmetry is to be noted in regard to their
placing; all the row of papillæ on the longer side of the bursa has been drawn some-
what more cephalic than those of the shorter side. It is, however, the question only
’) Anton Schneider: Monographie der Nematoden p. 84.
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