NO. 2131. 



NEMATODE PARASITES OF RODENTS— HALL. 



61 



Male 20.5 mm. long. Esophagus very short, the total length, in- 

 cluding the bulb, equal to one-fourteenth of the body length. The 

 tail (fig. 71) is short; the distance from the cloacal aperture to the 

 tip of the tail is 230 fx.. The sucker is feebly developed, elongated and 

 without chitinous ring. The caudal alae are straight. There are 

 10 pairs of caudal papillae, of which 5 are pre- 

 anal and 5 postanal. The most anterior pair of 

 preanal is asymmetrically disposed in the region 

 of the sucker; the second pair asymmetrically 

 disposed in the region near the origin of the 

 caudal alae; the third pair is asymmetrically 

 disposed in the region of the gubernaculum ; the 

 fourth and fifth pairs are close together and 

 slightly asymmetrical in the region just anterior 

 of the cloacal aperture, the fifth pair support- 

 ing the caudal alae. The first and second pairs 

 of postanal papillae are sessile and are sym- 

 metrically disposed; the third pair supports the 

 caudal alae; the fourth pair is sessile and sym- 

 metrical; the fifth pair is quite asymmetrical 

 and supports the caudal alae. The caudal glands 



open on the 



ventral surface 



between the 



third and fourth 



postanal papil- 

 lae. The spic- 

 ules are short 



and equal, 250 \). 



long. The gub- 



e r n a c u 1 u m is 



shaped like an 



arrowhead and 



is 120 ]i long. 

 Female 36 



mm. long, with a 



maximum thickness of C50 [x. The esophagus is very short ; its length, 

 including the bulb, is one-seventeenth of the total length of the worm. 

 The short tail (fig. 72) is conical and 915 pi long; the caudal glands 

 open in its posterior fourth. The inconspicuous vulva is anterior of 

 the middle of the body and divides the body in the ratio of 5 : 8. The 

 ovijector is directed posteriorly (?), the very elongated tube attain- 

 ing a length of 8 mm. The posterior uterus extends to the origin of 

 the rectum and the anterior uterus extends within a millimeter of the 



Fig. 70.— Allodapa elongata. Later- 

 al VIEW OF optical SECTION OF THE 



HEAD. X 120. After Seurat, 1914. 



Fig. 7.1.— Allodapa 

 elongata. poste- 

 RIOR extremity OF 

 male; ventral view. 

 a, Orifice of caudal 

 gland. After Seu- 

 rat, 1914. 



