The Roundworms of Domestic Swine With Special Reference to Two Species in the
The Roundworms of Domestic Swine With Special Reference to Two Species in the
Winthrop Davenport Foster
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The vesicula seminalis occupies most of the body cavity in the posterior end, maintaining a fairly uniform diameter until it disappears dorsal of the intestine which conceals the ductus ejacu- latorius. The long convoluted testis which extends to the middle of the body presents no specific characteristic features. The anus is I- mm. FIG. 28. Physocephalus sexalatus. General view of body of male. 5. , bursa; es. , esoph- agus; *p*. , spicules. X 23. (Original. ) 30 THE ROUNDWORMS OF DOMESTIC SWI...NE. circular, like that of Arduenna strongylina, but not surrounded by a serrated ring. I The vulva (35 ft in diameter), as in Arduenna strongylina, appar- ently occupies a somewhat lateral rather than ventral position, open- ing toward the right side (fig. 22). It is situated just below the middle of the body, dividing the worm in the ratio of 9 to 8. Accord- ing to Ciurea (1912) the cuticle in the region of the vulva is marked with longitudinal thickenings which may interlock with the cuticular ridges on the ventral surface of the male, and thus assist in maintain- ing the position of the male in copulation.
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