

PHYLUM NEMATHELMINTHES 



291 



(Fig. 235, /.;.). The muscles of the sheath are circular and act as protractors. 

 At the sides of the base of the proboscis two club-shaped organs, the lemniici 

 (fm.), hang down into the body-cavity. Their 

 function is quite unknown, but they have been 

 compared with the cervical glands of Nema- 

 todes (p. 284). 



Tn the body-wall run two longitudinal 

 vessels (r.) containing a granular fluid, and 

 connected with a network of fine canals in the 

 proboscis, bursa, &c. The function of these 

 vessels is not known with certainty : they may 

 have to do with, the absorption and circulation 

 of nourishment. 



The central nervous system (Fig. 236, nv.) 

 is represented by a single large ganglion placed 



FIG. 236. Echinorhynchus gigas -Dissec- 

 tion of male. b. bursu ; <. </t. cement glands ; 

 im. lemiiisci ; nv. nerve ganglion ; pi: pro- 

 boscis ; s. hi . suspensory ligament ; ts. testis ; 

 v. df. vas deferens. (After Leuckart.) 



Fia. 237. Echinorhynchus 

 gigas. Dissection of female 

 (semi-diagrammatic), b. bell ; 

 /in. lemniscf ; ~~pr. proboscis ; 

 x. it, -I/, swimming ovaries ; ut. 

 uterus ; vg. vagitia. 





the base of the proboscis, and sending off nerves in various directions. 

 In the male there are also two ganglia supplying the reproductive organs. 

 ans of sense are wholly absent. 



u 2 



