i84 



THE INVERTEBRATA 



tzT 



v.d- 



ves.se m. 



(jcn.at 



Fig. 148. Diagram of the genitalia of a planarian. After Steinmann. g.o. 

 opening of genital atrium (gen.at.) to exterior; miis.or. muscular organ; od. 

 oviduct; ov. ovary; p. penis; sp. stalked organ (bursa copulatrix); t. testis; 

 v.d. vas deferens; ves.sem. vesicula seminalis; vit. vitellarium. 



