NEW SPECIES OF FLATWORMS HYMAN 



421 



Figure 47. — New species of Dugesia and Sorocelis 



a-c, Dugesia titicacana: a. Type specimen ; b, posterior end, sliowing rliabdites, pigment 



zone, and adhesive zone ; c, sagittal view of the copulatory complex of the type. 



d e. Sorocelis americana: d. Entire worm ; e, head, showing brain and eye arrangement. 



I, Brain ; 2, mouth ; 5, rhabdites ; h, pigment zone ; 5, rhabdite-forming cells ; 6, adhesive 



zone; 7, copulatory bursa; 8, stalk of same; 9, entrance of oviducts in bursa stalk; 



10, penis bulb; 11, vas deferens; 12, seminal vesicle in penis bulb; 13, penis papilla; 



U, cement glands of atrium ; 15, common genital atrium. 



