REPRODUCTION AND DEVELOPMENT 



109 



Strands of conducting tissue running from the male genital 

 aperture to the ovaries, so that cross fertilization can be achieved 

 by introduction of a spermatophore into the male genital aperture 

 of another leech (Fig. 61). 



o.s 



c.t, 



cl.g, 



Fig. 60 



Fig. 61 



Fig. 60. Reproductive organs of Piscicola geometra, dorsal 

 view, c.t., conducting tissue; ej.d., ejaculatory duct; gl, glands 

 secreting wall of spermatophore; o.s., ovarian sac; t, testis sac; 

 v.n.c, ventral nerve cord. From Dawydoff, 1959, after Brumpt. 



Fig. 61. Sagittal section through Cystobranchus mammillatus 

 to show conducting tissue, a, male genital atrium; c.a., copu- 

 latory area; c.t., conducting tissue; cl.g., clitellar glands; g, gut; 

 m, muscular wall of atrium; o, ovarian sac; sp, spermatophore. 

 From Grasse, 1959, after Brumpt. 



