ZOOLOGY FOR MEDICAL STUDENTS CHAP. 



,l,nal excretory tube which runs along each side of the body, 



Mterruptedly through the chain of proglottides. The two 



onnected in ladder-like fashion close to the hinder limit of 



and in the last proglottis of the chain the transverse 



connect m- dumnel opens to the exterior. 



ous system consists of numerous sensory cells connected 

 with a network or plexus of nerve fibres lying just below the epidermis, 

 this network being connected in turn with a series of longitudinal trunks 



.s 



FIG. 78. 



i ^errata. A, Complete tape-worm ; B, scolex in side view ; C, scoiex, end view, h, Hooks ; 

 , rostcllum ; S, scolex ; s, sucker. 



leepei level. Of these longitudinal trunks there are ten, two 



of which, situated laterally, just external to the main excretory duct, 



jcr than the others. The longitudinal trunks are connected by 



Mimissures of which there is a specially complicated 



'ment in the " head " region. 



epnielui-ii arc hermaphrodite and of much complexity. 



inad <-, moists of numerous small spherical testes (Fig. 79, A, t] 



hout the parenchyma, each having a slender tubular 



vas effrr.-n, ronnrrinl with it. The vasa efferentia bt-comc joined to- 



