314 



ZOOLOGY 



SECT. 



ru> 



tn-i 



s.lg 



-Jbr 



protoplasmic masses situated in the body-cavity at the posterior end, near the 

 genital aperture. In the interior is a system of branching canals, the terminal 

 branches of which, each contained in one of the 

 terminal lobes of the tree-like nephridium, are 

 provided with ciliary flames ; at the end of each 

 lobe are a number of fine perforations placing the 

 contained canal in communication with the body- 

 cavity. The stalk of each nephridium contains a 

 single main canal ; these unite to form a wide 

 median dorsal channel which opens behind in the 

 female into the unpaired portion of the oviduct 

 and in the male into the ejaculatory duct. 



The greater part of the body-cavity is occupied 

 by the reproductive organs. The sexes are 

 separate, and the female is larger than the male. 



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FIG. 251. Echinorhynchus gigas. Dissec- 

 tion of male. b. bursa ; c. yl. cement glands ; 

 I in. lemnisci ; nv. nerve-ganglion ; ?>/. pro- 

 boscis ; 8. 1(1. suspensory ligament ; tx. testis ; 

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



Fin. 2VJ. Echinprhynchus 



gigas. Dissection of female 

 (semi-diagrammatic). !>. bell ; 

 Im, lemnisci ; pr. proboscis ; 

 s. or//, swimming ovaries ; i>i. 

 uterus ; ///. vagina. 



In both sexes the gonads and their ducts are connected with a great 

 li<l<ini< at (*./'/.), which extends backwards from the end of the proboscis- sheath. 

 In the male there are two ovoidal /f-.s/e-s (Fig. 251, fs.) connected with the 



