448 



THE ANIMAL PARASITES OF MAN 



from the lateral excretory canals (fig. 326) running in the lateral 

 lines or bands. The cervical glands are swollen anteriorly, forming 

 the so-called ampullae just in front of the bridge. They extend 

 backwards a little beyond the anterior loop of the testis. 



Lateral Lines. (i) Are broad elevations of the subcuticle, in 

 which, here and there, a nucleus occurs. (2) Near the bursa in the 

 male they increase in volume, and finally divide into branches which 

 form the "pulp" of the different rays. (3) In addition to the lateral 

 lines or bands, there is also a dorsal and ventral band. (4) The 



FIG. 326. Ancylostoma duodenale : diagrammatic representation of excretory system 

 ex.p.) excretory pore; e.c.g., excretory cervical gland ; Ex. ves., excretory vesicle in B.C., 

 bridge cell, which is connected with e.g. , cervical gland, and /./., lateral lines; ceph.g., 

 cephalic gland ; l.ex.c., lateral excretory canal passing into the bridge cell ; /./., lateral line 

 containing excretory canal and cephalic gland; c.p. , cervical papilla; n., nuclei of bridge 

 cell. (After a drawing of Looss.) 



ventral band is well developed caudally, forming a large pad dorsal 

 to the cloaca, "pulvillus post-analis." 



The bursal rays are outgrowths of the lateral lines. Beside this 

 " pulp " they contain a nerve, and at their bases complex muscles. 



The Bursa is closed on all sides with a short median (ventral) lobe, 

 which may be tucked inwards. It is an outgrowth of the inner layer 

 of the skin pushing the outer layer before it, so that it consists of three 

 layers, not four, as it would be if it were a fold. The bursa is twice 

 as broad as long. It is supported by a variety of rays, the arrange- 

 ment of which is best followed from the figure (fig. 327). The 



