120 PARASITOLOGY. 
and do not project over the collar. See figures 
1, 4 and 6, Plate 9, and 9 in Plate 9. The inner 
part of this mouth-collar rests on the anterior 
border of the mouth-capsule. The skin is thick. The 
head is provided with papillae and the four submedian 
are marked by a short point composed of the chitinous 
substance of the mouth-collar and projecting at the 
base of the anterior leaf-crown. The fibers of the 
papillary nerves terminate immediately beneath them. 
The lateral papillae are not provided with these points 
and do not project over the collar. See figures 1, 4 
and 6 of Plate 9, and 9, Plate 9. 
The intestine is composed of two rows of epithe- 
lial cells, one dorsal and one ventral. These cells are 
very large and contain large oval nuclei. This is best 
seen on cross section of the worm. 
The digestive tract consists of the following 
structures: mouth, esophagus, intestine (chyle intes- 
tine) and rectum. 
The papillae are connected with the central nervous 
system four of the fibers going to the four lateral 
papillae and four to the submedian papillae. 
The bursa of the male is rather small. See 
figure 5, Plate 9, and figure 10, Plate 9, and 
figure 17, Plate 10. The genital opening is placed 
at the top of the genital cone on the ventral 
surface of the body. The two spicules are thin and 
slender. The vulva of the female is anterior to the 
anus and in the posterior third of the body. 
The male is provided with glands which secrete a 
gummy substance and is delivered in the region of 
the caudal pouch and literally cements the pouch to 
the female during the copulatory act. 
