4:QQ Curtis, On the reproductive system of Plan, symplissima. 



sented in its relation to the dorsal surface, the gut-lobes, the oviduct 

 and nerve chord. B. and L. ^/^ Obj., 2 In. eye-piece. 



Fig. 11. From a transverse section through an oviduct and ovary 

 near the point of union. The scattered condition of the ovary is shown. 

 An early stage of the vitellaria appears as a blunt process from the 

 oviduct. B. and L. ^/g Obj., 1 In eye-piece. 



Fig. 12. Two fibres from the main longitudinal system of the 

 dermal musculature. The outline of the fibres is shown. With no 

 attempt to represent the fibrillae or other structures. Within it are 

 certain dark areas that lie in the 'Rindenschicht' of the fibre and may 

 represent nuclear material. B. and L. i/jg Obj-? ^ ^^- eye-piece. 



Fig. 13. A longitudinal vertical section through the region of the 

 testes of one side (see Fig. 1, PI. 31), the course of testicular canals 

 and vas deferens is shown by the dotted lines. One of the testes 

 has a double connection with the vas deferens. B. and L. ^/^ Obj., 

 2 In. eye-piece. 



Fig. 14. A horizontal section through an oviduct near the 

 posterior end, showing spermatozoa in the lumen and the connection 

 with branching strings of the yolk-glands. B. and L. */j2 Obj., 2 In. 

 eye-piece. 



