PLATE 35. 



Fig. 17. Gyrocotyle fimbriata. Diagram of the nervous system of the 

 posterior extremity. From Kofoid and Watson (1910, fig. 3). 



Fig. 18. Diagram of the arrangement of muscle-layers in the saggital 

 section. 



Fig. 19. Diagram showing track made by living specimen across 

 dish. Distance traversed, about 14cm.; four contractions. 



Fig. 20. Sketch of network of excretory canals in the lateral fold 

 as seen in a living specimen. Zeiss-Greenough binocular. 



Fig. 21. Diagram, reproductive system, typical heterocotylean trema- 

 tode. (After Benham, 1891, p. 51.) 



cut. cuticle. 



cut. trans. cuticular transverse muscle. 



cut. long. cuticular longitudinal muscles. 



dist. r. comm. distal ring commissure. 



ex. can. excretory canal. 



in. long. inner longitudinal muscle. 



in. trans. inner transverse muscle. 



lat. A lateral fold. 



lat. long. conn. lateral longitudinal connective. 



marg. ex. sin. marginal excretory sinus. 



med. long. conn. median longitudinal connective. 



out. long. outer longitudinal muscle. 



out. trans. outer transverse muscle. 



post. ~br. comm. posterior bridge commissure. 



subcutic. 1. subcuticular layer. 



vit. vitellaria. 



v. op. vaginal opening. 



[442] 



