NO. 2131. 



NEMATODE PARASITE,"? OF RODENTS— HALL. 



101 



series and the cloacal aperture the ventral surface also bears two 

 rows of small shields or bosses. The region about the cloacal aper- 

 ture bears several large sessile pnpillae; there are six prcanal papil- 

 lae, of which four are in the same transverse line along the 

 superior lip of the cloaca ; the inferior lip bears three papil- 

 lae, of which the median is the larger; immediately posterior 

 is a contiguous pair of large papillae, and a little posterior 

 of these is a pair of large cuticular shields. The apertures 

 of the caudal glands open at the level of the origin of the 

 tail. Spicule (fig. 121) very small, 85 \l long; no guber- 



1 ' Fig. 124.— 



naculum. derma- 



Female 16 to 17 mm. long, with a maximum thickness of toxys 

 600 II. The posterior extremity (fig. 125) is conical, regu- ra. spic- 

 larly attenuated, and may terminate in a point covered by a m-E. en- 

 small, brown, chitinous, thimble-shaped cap; this appears aftkr 

 to be deciduous and is often not present. The tail is seurat, 

 aijout 3 mm. long, or almost one-sixth of the length of 

 the body. The excretory pore opens on the ^"entral surface, about 

 1.3 mm. posterior of the esophageal bulb. The vulva is about 85 

 [L broad, not prominent, and is situated anterior of the middle of 

 the body, about 7 mm. from the anterior extremity. It is commonly 



covered with a brown or reddish- 

 brown plug. It opens into a vagina 

 lined Avith a thick cuticle and joining 

 a cuticular ovijector (fig. 126) which 

 extends anteriorly a distance of 1 

 mm. ; both the vagina and the ovi- 

 jector are provided with a thick mus- 

 cular tunic. In its distal region, 

 corresponding to a spliincter, there 

 is a deeper colored glandidar organ, 

 which in turn connects with the ante- 

 rior musculo-epithelial portion of the 

 ovijector, a straight tube 12 mm. long 

 which extends to a point just poste- 

 rior of the anus ; in this posterior por- 

 tion it enlarges and contains a number 

 of eggs; from this portion the uteri 

 diverge as straight tul)es contain- 

 ing two or three rows of eggs and 

 extending parallel to the preced- 

 ing portion of the ovijector for a 

 Their anterior extremities, slightly dihited to 



ITTomm: 



— ^ 



Fig. 125.— Dermatoxys veligera. 

 Posterior extremity of female. 



distance of 9 mm. 



form in each a receptaculum seminis, communicate with the ovaries 



by narrow S-shaped oviducts; the massive ovaries, of deeper color. 



