12G PLANARIA. 



IX. Some Planarise multiply by spontaneous division of the body, 

 a fragment becoming an entire animal after separation. 



X. Many species are endowed with a powerful reproductive faculty, 

 whereby each of many parts into which a specimen may be mutilated 

 becomes an entire animal. 



XI. Redundances of important organs to subsist at once is obtained 

 by artificial laceration of a specimen. 



PLATE XIV. 



FIG. 1. Planaria cornuta, back. 



2. The same, belly. 



3. Under surface of a specimen, shewing the distribution of the vessels. 



enlarged. 



4. Spawn, enlarged. 



5. Planaria corniculata, back. 



6. The same, belly. 



7. Spawn. 



8. Ova, or capsules of same, enlarged. 



9. Planaria ellipsis. 



10. Another specimen, enlarged, back. 



11. The same, belly. 



12. Another specimen, shewing the appearance of the vessels, enlarged. 



13. Surface of the head, shewing the distribution of the specks, enlarged. 



14. Internal vessels, magnified. 



15. Spawn. 



16. Portion of the same, enlarged. 



17. Planariafaxilis, back. 



18. The same, belly. 



19. Surface of the anterior portion, shewing the position of the ocular 



specks, enlarged. 



20. Spawn. 



21. Spawn. 



22. Ova or capsules of the same, enlarged. 



23. Ova or capsules, enlarged. 



24. Nascent Planaria from the same ova or capsules, enlarged. 



25. Nascent Planaria from the capsule, shewing the position of the four 



clusters of ocular specks, enlarged. 



