136 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



EXPLANATION OF PLATE XVL 



Fig. II. The reproductive system: a., anterior sucking discs; 6., brain; e., 

 outer opening of excretory system; ov.^ ovary; re., excretory 

 reservoir; t., testis, «., uterus; v. d., vas deferens; y. d., yolk- 

 ducts; y. /., yolk follicle. 



Fig. 12. The digestive system. The position of the salivary glands [s.), 

 the prostate glands {p.), and glands passing into the posterior 

 sucker are also shown. 



Fig. 13. Diagram of the reproductive system: 0., ootype, or egg-mould; ov., 

 ovary ;^., ducts from prostate glands; p. r., reservoir for prostate 

 secretion; s. g., shell glands; s.r., seminal receptacle; «., uterus; 

 v., vagina; v. c, vitelline canal; v. d., vas deferens; y., yolk reser- 

 voir; X., problematical cells lining the vas deferens. 



Fig. 14. Longitudinal section through the body: b., brain; 0., o5type, or egg- 

 mould; ov., ovary, ph., pharynx; pr., prostate reservoir; s., gland 

 cells passing into sucker; t., testis; y., yolk reservoir. 



Fig. 15. Terminal excretory (flame) cells: a. b., distended with waste 

 matters. 



Fig. 16. Excretory cells and connecting branches. 



Fig. 17. Longitudinal section through the pharynx. (For explanation see 

 text). 



Fig. 18. The eyes, which normally are farther apart. [Cf. fig. 5). 



Fig. 19. The excretory system: re., excretory reservoir. 



