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. 



